Calcaneus Fracture

1. Clinical Overview

Summary

Calcaneus fractures represent the most common tarsal bone injury, accounting for approximately 60% of all tarsal fractures and 2% of all fractures. [1] These injuries typically result from high-energy axial loading mechanisms, most commonly falls from height, where the talus is driven into the calcaneus like a wedge, fracturing and depressing the posterior facet—the primary weight-bearing articular surface of the subtalar joint. [2]

The management of displaced intra-articular calcaneal fractures remains one of the most controversial topics in orthopaedic trauma surgery. The landmark UK Heel Fracture Trial (2014) and subsequent meta-analyses have challenged traditional surgical approaches, yet current evidence suggests that anatomical restoration of the posterior facet through operative fixation improves functional outcomes in carefully selected patients, particularly younger, non-smoking individuals with Sanders Type II and III fractures. [3,4]

A critical subset of calcaneal fractures—the Tongue-Type fracture—represents a true orthopaedic emergency. In this pattern, the superior calcaneal tuberosity is avulsed by the Achilles tendon and displaces posteriorly, creating imminent risk of posterior skin necrosis. Without urgent closed or percutaneous reduction within 6-8 hours, skin compromise can lead to devastating complications including osteomyelitis, chronic wounds, and potential amputation. [5]

The long-term sequelae of calcaneal fractures are substantial regardless of treatment modality. Even with optimal management, patients frequently develop subtalar arthritis (40-75% at 5 years), chronic heel pain, heel widening with peroneal impingement, and significant functional limitations that impact occupational capacity and quality of life. [6,7]

Key Facts

The "Lover's Fracture": Historically termed the "Don Juan Fracture" in older European literature, this eponym derives from the romantic notion of suitors escaping jealous spouses by jumping from bedroom balconies, landing on their heels. While colorful, this mechanism represents only a subset of cases; modern series show motor vehicle accidents and industrial falls as predominant causes. [8]

Spinal Association: Approximately 10% of patients sustaining calcaneal fractures from axial loading mechanisms have concurrent lumbar vertebral compression fractures, most commonly at the thoracolumbar junction (T12-L2). The shared mechanism involves transmission of axial forces through the lower extremity and pelvis into the spine. Systematic spine imaging protocols are mandatory in all high-energy calcaneal fractures. [9]

The Constant Fragment: The sustentaculum tali, a medial shelf-like projection of the calcaneus supporting the middle facet of the subtalar joint, remains relatively fixed in position due to robust attachment of the interosseous talocalcaneal ligament and deltoid ligament complex. This "constant fragment" serves as the anatomical reference point for surgical reconstruction, with all other fracture fragments reduced and aligned to this stable medial structure. [10]

Bilateral Injury: Between 5-10% of calcaneal fractures are bilateral, occurring when patients land on both feet simultaneously. This bilateral injury pattern has significant implications for rehabilitation, as patients cannot bear weight on either extremity, necessitating wheelchair dependence during the prolonged non-weight-bearing period. [11]

Clinical Pearls

"The Mondor Sign": Extensive plantar ecchymosis extending to the sole and medial arch of the foot is pathognomonic for calcaneal fracture, distinguishing it from ankle injuries where bruising remains confined to the hindfoot and lateral malleolus. This sign results from tracking of hematoma along plantar fascia and intrinsic muscle compartments. [12]

"Bohler's Angle": Measured on true lateral radiographs by drawing two intersecting lines—the first from the highest point of the anterior process to the highest point of the posterior facet, the second from the posterior facet to the superior tuberosity. Normal values range from 20-40°. Angles below 20° indicate significant posterior facet depression and correlate with worse functional outcomes. Loss of Bohler's angle is the most important plain radiographic predictor of intra-articular involvement. [13]

"Gissane's Angle" (Critical Angle): Formed by the intersection of the downward and upward slopes of the superior calcaneal surface on lateral radiographs, normally measuring 100-130°. Fractures typically cause widening (> 130°) of this angle, reflecting disruption of the crucial angle region where the anterior process and posterior facet meet. While less clinically utilized than Bohler's angle, it provides complementary information about fracture morphology. [14]

"Tongue-Type Emergency": When the posterosuperior calcaneal fragment (tuberosity) is avulsed by the Achilles tendon pull and displaces superiorly, it creates a tent-pole effect against the thin posterior skin envelope. The skin blanches, stretches, and loses blood supply within hours. This represents one of the few true orthopaedic emergencies requiring immediate reduction—either closed manipulation with forced plantarflexion or percutaneous pin joystick reduction. Delay beyond 8-12 hours significantly increases skin necrosis risk. [15]

"The Wrinkle Sign": Before proceeding with extensile lateral surgical approaches, the soft tissue envelope must demonstrate adequate recovery from initial injury swelling. The "wrinkle sign"—return of normal skin creases and wrinkles over the lateral heel—indicates resolution of edema and readiness for surgery, typically occurring 10-21 days post-injury. Operating before wrinkle sign appearance dramatically increases wound complications, which can approach 40-50% in edematous tissue. [16]

"Smoking is an Absolute Contraindication": Multiple studies demonstrate catastrophic wound complication rates (up to 90%) in smokers undergoing extensile lateral approach ORIF. Active smoking should be considered an absolute contraindication to open surgical approaches; these patients are better served by conservative management, minimal incision techniques, or delayed primary fusion. [17]

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2. Epidemiology

Incidence and Demographics

Calcaneal fractures occur with an estimated incidence of 11.5 per 100,000 person-years in mixed populations, with significant variation based on geographic location, industrial base, and measurement methodology. [18] Rates are higher in regions with substantial construction, oil field, or industrial work (up to 20 per 100,000), and lower in predominantly service-economy populations. [19]

Age Distribution: The typical patient is a male aged 30-50 years engaged in manual labor or industrial work. This represents the peak working age population, making the socioeconomic impact of these injuries substantial. Pediatric calcaneal fractures are rare (less than 5% of cases) and typically involve different fracture patterns (avulsion fractures, extra-articular fractures). Elderly patients may sustain lower-energy calcaneal fractures from simple falls, though these often occur in the context of osteoporosis and may have different prognosis. [20]

Gender Distribution: There is a strong male predominance (male:female ratio approximately 4-5:1), reflecting occupational exposure patterns. Women account for a minority of cases, with falls from height during leisure activities (hiking, climbing) being more common mechanisms than industrial injury. [21]

Laterality: The majority of calcaneal fractures are unilateral, though bilateral fractures occur in 5-10% of cases. Bilateral injuries carry worse prognosis due to inability to use either lower extremity for mobility during the prolonged non-weight-bearing period, leading to deconditioning, higher DVT risk, and more challenging rehabilitation. [11]

Injury Mechanisms

Fall from Height (> 2 meters): The predominant mechanism, accounting for 60-75% of adult calcaneal fractures. Common scenarios include:

• Industrial falls from ladders, scaffolding, roofing (60-70%)
• Recreational falls during hiking or climbing (15-20%)
• Intentional jumps (attempted suicide or escape) (10-15%)
• Domestic falls from step-ladders or stairs (5-10%) [22]

Motor Vehicle Collisions: Account for 15-25% of cases, occurring when:

• The foot is braced against the floorboard or brake pedal during frontal impact
• The driver/passenger is ejected and lands on feet
• Motorcycle crashes with foot-first landing
• These cases often involve polytrauma with higher injury severity scores [23]

Other Mechanisms: Include:

• Direct crush injuries (less than 5%)
• Stress fractures in military recruits and endurance athletes (less than 5%)
• Low-energy falls in elderly with osteoporosis (5-10%)
• Gunshot wounds (less than 1%) [24]

Associated Injuries

The high-energy axial loading mechanism means calcaneal fractures frequently occur as part of polytrauma:

Spinal Fractures: Found in 8-10% of patients, predominantly:

• Thoracolumbar junction compression fractures (T12-L2) - 60%
• Lumbar burst fractures - 30%
• Other spinal injuries - 10%
• These injuries may be neurologically significant and require independent treatment [9]

Lower Extremity Fractures: Co-occur in 15-25%:

• Pilon fractures (distal tibia)
• Tibial plateau fractures
• Femoral shaft/neck fractures
• Contralateral calcaneal fractures
• Ipsilateral ankle fractures [25]

Other Polytrauma: In motor vehicle mechanisms:

• Pelvic fractures
• Solid organ injuries
• Traumatic brain injury
• Long bone fractures

Risk Factors for Poor Outcomes

Patient Factors:

• Active smoking: Single strongest predictor of wound complications and worse functional outcomes [17]
• Diabetes mellitus: Impaired wound healing, higher infection risk, neuropathic complications [26]
• Peripheral vascular disease: Compromised healing capacity
• Obesity (BMI > 30): Increased wound complications, technical surgical difficulty [27]
• Workers' compensation/litigation: Consistently associated with worse patient-reported outcomes independent of injury severity [28]
• Advanced age (> 60): Lower functional demands but worse healing capacity

Injury Factors:

• Sanders Type IV fractures (highest comminution)
• Open fractures (infection risk > 40%)
• Significant soft tissue injury (fracture blisters, compartment syndrome)
• Bilateral injuries
• Polytrauma context
• Delay to treatment (> 3 weeks) [29]

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3. Anatomy and Pathophysiology

Functional Anatomy of the Calcaneus

The calcaneus is the largest tarsal bone, serving as the foundation of the longitudinal arch and the primary structure for heel strike during gait. Understanding its complex three-dimensional anatomy is essential for surgical reconstruction.

Bony Architecture:

Articular Surfaces:

• Posterior Facet: The largest and most important articular surface, occupying the superior-middle portion of the bone. This facet articulates with the posterior facet of the talus and constitutes the primary weight-bearing surface of the subtalar joint, transmitting 80% of loads. The posterior facet is roughly triangular, angled laterally and posteriorly. [30]
• Middle Facet: Smaller articular surface on the superior aspect of the sustentaculum tali, articulating with the middle talar facet
• Anterior Facet: Variable surface on the anterior calcaneus, articulating with the talar head
• Cuboid Facet: Anterolateral surface articulating with the cuboid bone at the calcaneocuboid joint, part of the transverse tarsal (Chopart) joint

Extra-articular Regions:

• Calcaneal Tuberosity: The large posterior prominence providing insertion for the Achilles tendon superiorly and origin for the plantar fascia and intrinsic foot muscles inferiorly. Contains medial and lateral tubercles on the plantar surface.
• Sustentaculum Tali: A shelf-like medial projection supporting the middle facet, firmly attached to the talus via the interosseous talocalcaneal ligament. The flexor hallucis longus (FHL) tendon runs in a groove on its inferior surface. This structure's constant position makes it the surgical reference point. [10]
• Anterior Process: Projects anteriorly and medially, providing attachment for the bifurcate ligament and serving as the medial buttress
• Lateral Wall: The lateral surface of the calcaneal body, which in fractures often displaces laterally causing heel widening and fibular impingement
• Sinus Tarsi: The cone-shaped space between the talus and calcaneus laterally, containing fatty tissue, proprioceptive nerves, and the interosseous talocalcaneal ligament

Internal Architecture: The calcaneus consists of a thin cortical shell surrounding cancellous bone organized into trabecular struts. Three primary trabecular systems provide structural support:

• Superior: From posterior facet to tuberosity
• Inferior: From calcaneocuboid joint to tuberosity
• Neutral triangle: Central area of relative weakness where fracture compression occurs [31]

Soft Tissue Envelope:

Medial Structures:

• Deltoid ligament (tibionavicular and tibiocalcaneal components)
• Posterior tibial tendon, flexor digitorum longus, flexor hallucis longus
• Posterior tibial neurovascular bundle (deep to flexor retinaculum)
• Spring ligament complex (calcaneonavicular ligament)
• Medial plantar artery and nerve

Lateral Structures:

• Peroneus longus and brevis tendons (in retrofibular groove)
• Calcaneofibular ligament (lateral ankle stabilizer)
• Sural nerve (vulnerable during lateral surgical approaches)
• Lateral calcaneal artery (branch of peroneal artery)
• Thin lateral skin with limited soft tissue coverage

Posterior Structures:

• Achilles tendon (tendo calcaneus) inserting on posterior tuberosity
• Retrocalcaneal bursa
• Posterior skin envelope (thin, vulnerable to pressure necrosis)
• Posterior tibial artery branches

Plantar Structures:

• Plantar fascia (central, medial, lateral bands)
• Four layers of intrinsic foot muscles
• Medial and lateral plantar neurovascular bundles
• Heel fat pad (specialized fibro-adipose compartmented structure providing shock absorption)

Biomechanics of Injury

Mechanism of Fracture:

When a patient lands on the heel from height, enormous axial compressive forces (often exceeding 10× body weight) are transmitted through the talus into the calcaneus. The talus acts as a wedge, being driven inferiorly into the calcaneal body. This creates a predictable fracture pattern: [32]

1. Primary Fracture Line: Initiated at the crucial angle (angle of Gissane), propagating postero-laterally through the posterior facet, creating the classical "dividing line" separating the sustentaculum fragment (medial) from the tuberosity fragment (lateral)

2. Secondary Fracture Lines: Depending on force magnitude and direction, additional fractures create increasing comminution:

   • Joint Depression Type: Posterior facet depresses centrally with variable comminution
   • Tongue Type: Secondary horizontal fracture line exits posteriorly, creating a superior tongue-shaped fragment attached to Achilles
   • Joint Depression + Lateral Wall Blowout: Lateral wall displaces laterally, widening the heel
   • Severe Comminution: Multiple secondary fracture lines creating numerous fragments (Sanders IV) [33]

3. Deformity Pattern: The classical post-fracture deformity includes:

   • Loss of calcaneal height (decreased Bohler's angle)
   • Loss of calcaneal length
   • Widening of the heel (lateral wall displacement)
   • Varus or valgus deformity of the tuberosity
   • Posterior facet incongruity (step-off, gap, depression)
   • Decreased calcaneal-first metatarsal angle (arch collapse) [34]

Energy Dissipation: The calcaneus is designed to absorb impact forces during normal gait through:

• Trabecular compression in the neutral triangle region
• Deformation of the heel fat pad
• Elastic deformation of the cortical shell

In high-energy trauma, these mechanisms are overwhelmed, resulting in structural failure (fracture) with residual plastic deformation even after fracture healing. [35]

Classification Systems

Sanders Classification (CT-Based) [36]

The most widely utilized prognostic classification, based on coronal CT imaging through the posterior facet at its widest point (typically 1.5cm anterior to the posterior border):

Type I: No displacement of posterior facet (less than 2mm fracture gap)

• Essentially non-displaced fractures
• Excellent prognosis with conservative treatment
• Frequency: 15-20% of intra-articular fractures

Type II: Single fracture line through posterior facet creating two fragments

• IIA: Lateral fracture line (dividing line creating sustentaculum + lateral fragments)
• IIB: Central fracture line (sustentaculum + central + lateral fragments)
• IIC: Medial fracture line (less common pattern)
• Frequency: 30-35% of intra-articular fractures
• Best surgical outcomes: Anatomic reduction achievable in most cases

Type III: Two fracture lines creating three fragments

• IIIAB: Lateral and central fracture lines
• IIIAC: Lateral and medial fracture lines (depression of entire central portion)
• IIIBC: Central and medial fracture lines
• Frequency: 25-30% of intra-articular fractures
• Moderate surgical outcomes: Technically demanding reconstruction

Type IV: Comminuted with three or more fracture lines (four or more fragments)

• Severe fragmentation of posterior facet
• Frequency: 25-30% of intra-articular fractures
• Poor outcomes regardless of treatment: Often proceed to secondary subtalar fusion
• Some surgeons advocate for primary fusion rather than ORIF in these injuries

Correlation with Outcomes: Sanders Type strongly correlates with functional outcomes, with Type I having excellent results (> 90% good/excellent), Type II 70-80%, Type III 60-70%, and Type IV less than 50% achieving good results even with optimal surgery. [37]

Essex-Lopresti Classification (Radiographic) [38]

Based on lateral radiographs, this older classification remains clinically relevant for understanding fracture patterns:

Tongue Type (25-30%):

• Secondary fracture line exits posteriorly through the tuberosity
• Creates a tongue-shaped superior fragment attached to Achilles tendon
• Clinical significance: Risk of posterior skin compromise; amenable to percutaneous joystick reduction

Joint Depression Type (70-75%):

• Secondary fracture lines do not exit posteriorly
• Posterior facet depressed centrally with variable lateral wall displacement
• Clinical significance: Require elevation of posterior facet fragments; less amenable to percutaneous techniques

Other Classifications:

Rowe Classification: Based on involvement of subtalar joint (non-articular vs. articular)

Zwipp Classification: Three-dimensional classification considering articular involvement, displacement, and soft tissue injury; complex but comprehensive

AO/OTA Classification: Alphanumeric system (82-A, B, C) based on extra-articular vs. intra-articular patterns

Clinical Utility: While multiple classifications exist, the Sanders CT-based system has become the standard for surgical decision-making and outcome prediction in contemporary practice. [39]

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4. Clinical Presentation

History

Mechanism of Injury: Essential to elicit detailed mechanism:

• Height of fall (> 2m suggests high energy)
• Landing surface (concrete vs. sand vs. water)
• Unilateral vs. bilateral landing
• Associated injuries or loss of consciousness
• Occupational setting (workers' compensation implications)
• Time since injury (important for surgical planning)

Immediate Post-Injury:

• Inability to weight bear (universal finding)
• Immediate severe pain and swelling
• Awareness of "something breaking" or "crunching" sensation
• Rapid bruising development

Current Symptoms:

• Severity and character of pain
• Ability to move ankle/subtalar joint
• Numbness or paresthesias (nerve injury or compartment syndrome)
• Any skin breakdown or open wound

Past Medical History - Critical Elements:

• Smoking history: Current smoker status is critical for surgical planning
• Diabetes mellitus and glycemic control
• Peripheral vascular disease
• Previous foot/ankle surgery or injury
• Anticoagulation medication
• Tetanus immunization status (if open fracture)

Functional History:

• Occupation and physical demands
• Baseline ambulatory status
• Athletic activities
• Workers' compensation or litigation status

Physical Examination

Inspection (Compare to contralateral side):

Deformity:

• Heel widening: "Squashed orange" appearance from lateral wall blowout - heel appears broader when viewed from behind
• Loss of height: Decreased distance from floor to malleoli
• Varus/valgus alignment: Assess hindfoot alignment from posterior view

Soft Tissue:

• Swelling: Typically massive, encompassing entire hindfoot
• Ecchymosis:
  • "Mondor's sign: Plantar bruising extending to arch/sole (pathognomonic)"
  • Medial and lateral bruising
  • Time course (immediate vs. delayed suggests different injury patterns)
• Fracture blisters:
  • Blood-filled (dermal-epidermal junction disruption) vs. serous
  • Location (medial > lateral typically)
  • Clear blisters → Can operate through after re-epithelialization
  • Blood-filled → MUST wait for complete resolution (2-3 weeks minimum) [40]
• Skin condition:
  • "Wrinkle sign: Presence/absence of skin creases (indicates resolution of edema)"
  • Skin blanching, tension, or compromise (especially posteriorly in tongue-type)
  • Open wounds (open fracture)

Neurovascular Status (MANDATORY documentation):

• Arterial: Posterior tibial and dorsalis pedis pulses (palpation and Doppler)
• Capillary refill: Should be less than 2 seconds in all toes
• Sensation: Test all major nerve distributions:
  • Posterior tibial nerve (plantar sensation)
  • Deep peroneal nerve (first web space)
  • Superficial peroneal nerve (dorsal foot)
  • Sural nerve (lateral foot)
  • Saphenous nerve (medial foot)
• Motor: Toe flexion/extension, ankle dorsiflexion/plantarflexion (often limited by pain)

Palpation:

• Tenderness: Maximal over fracture site (entire calcaneus typically tender)
• Crepitus: Often present with displaced fractures
• Compartments: Assess for firmness suggesting compartment syndrome
  • Medial compartment (abductor hallucis)
  • Central compartment (flexor digitorum brevis)
  • Lateral compartment (abductor digiti minimi)
  • Interosseous compartment (deepest)
  • Calcaneal compartment (within calcaneus itself - rare) [41]

Range of Motion:

• Ankle (tibiotalar): Usually preserves some motion (pain-limited)
• Subtalar joint: Typically no motion tolerated; attempt gentle inversion/eversion assessment
• Transverse tarsal: Assess midfoot mobility
• Toes: Check for clawing (compartment syndrome indicator)

Special Tests:

Compartment Syndrome Assessment (Clinical Diagnosis):

• Pain out of proportion to injury
• Pain with passive toe extension (most sensitive finding)
• Progressive paresthesias
• Tense, firm compartments
• Late findings (muscle weakness, pulselessness) indicate irreversible damage [42]

Skin Threat Assessment:

• Posterior skin tension and blanching (tongue-type)
• Skin perfusion (capillary refill over fracture site)
• Temperature compared to contralateral side

Associated Injury Screening:

• Spine: Palpate entire spine for tenderness (T-L junction priority); log-roll if trauma setting
• Pelvis: Palpate iliac crests and pubic symphysis
• Contralateral foot: Examine thoroughly (10% bilateral)
• Ipsilateral limb: Examine entire lower extremity for associated fractures

Clinical Patterns and Variants

Open Fractures (5-10%): [43]

• Typically medial wound from spike of bone penetrating thin medial skin
• High infection risk (> 40% even with prompt treatment)
• Require urgent irrigation, debridement, antibiotics, tetanus
• Generally treated with staged reconstruction or primary fusion
• Gustilo classification applies (most are Type II or IIIA)

Tongue-Type with Skin Threat (10-15% of displaced fractures):

• Posterior superior fragment displaces proximally
• Creates tent-pole effect on posterior skin
• Skin blanching, shiny appearance
• Achilles tendon pull exacerbates displacement
• ORTHOPAEDIC EMERGENCY - Reduce within 6-8 hours

Bilateral Fractures (5-10%):

• Often more symmetric injury patterns
• Profound functional impact (wheelchair-dependent during healing)
• Higher VTE risk
• Psychosocial challenges
• May require staged surgical treatment if both require ORIF

Low-Energy in Elderly:

• Simple fall mechanism
• Often lesser displacement
• Osteoporotic bone (fixation challenges)
• Lower functional demands
• Higher medical comorbidity
• Generally managed conservatively unless grossly displaced

Stress Fractures:

• Military recruits, endurance athletes
• Insidious onset heel pain
• Gradual activity-related pain worsening
• Radiographs initially negative (MRI diagnostic)
• Conservative management with activity modification

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5. Investigations

Radiographic Imaging

Plain Radiographs - Initial Study:

Standard Views:

1. Lateral Foot/Ankle: Most informative single view

   • Assess Bohler's angle (normal 20-40°)
   • Assess Gissane's angle (normal 100-130°)
   • Visualize tongue-type vs. joint-depression pattern
   • Assess overall calcaneal morphology
   • Identify associated fractures (talus, ankle)

2. Anteroposterior (AP) Foot: Less helpful for calcaneus specifically

   • Can identify anterior process fractures
   • Shows calcaneocuboid joint
   • Assess foot alignment

3. Harris Axial View (Anthonsen view): Specialized calcaneal view [44]

   • Patient dorsiflexes ankle maximally
   • Beam angled 45° cephalad
   • Best view for: Heel width, varus/valgus alignment of tuberosity, lateral wall blowout, sustentaculum involvement
   • Often not obtained acutely (patient cannot position due to pain)
   • Valuable for monitoring reduction

4. Broden's Views: Oblique views for posterior facet (rarely used now with CT availability)

Radiographic Measurements:

Bohler's Angle: [13]

• Line 1: Anterior process peak to posterior facet peak
• Line 2: Posterior facet peak to superior tuberosity
• Normal: 20-40° (mean ~30°)
• less than 20°: Significant posterior facet depression
• Negative angle: Severe collapse
• Prognostic value: Strong correlation with functional outcomes
• Limitation: Does not capture lateral comminution or sustentaculum involvement

Gissane's Angle (Critical Angle): [14]

• Formed by downslope and upslope of superior calcaneal surface
• Normal: 100-130° (mean ~115°)
• Fractures typically increase this angle (> 130°)
• Less reliable than Bohler's angle
• Represents region of structural weakness where fracture initiates

Calcaneal Height:

• Distance from inferior calcaneus to posterior facet dome
• Decreased in compressed fractures

Calcaneal Width:

• Best assessed on Harris axial view
• Increased width indicates lateral wall blowout

Computed Tomography (CT)

Indications: ALL intra-articular calcaneal fractures warrant CT imaging [45]

Protocol:

• Fine-cut (1-2mm) axial images through entire calcaneus
• Coronal reconstructions: ESSENTIAL - Primary plane for Sanders classification
• Sagittal reconstructions: Helpful for anterior process and tongue-type assessment
• 3D reconstructions: Useful for surgical planning and patient education but not required for classification

Information Obtained:

1. Sanders Classification: Determines prognosis and guides treatment
2. Fracture Pattern: Tongue vs. joint-depression, number and location of fragments
3. Posterior Facet: Step, gap, depression, comminution degree
4. Sustentaculum: Involvement vs. constant fragment confirmation
5. Anterior Process: Separate fracture identification
6. Calcaneocuboid Joint: Involvement assessment (poorer prognosis if involved)
7. Lateral Wall: Degree of blowout and impingement on fibula
8. Achilles Insertion: Tuberosity fragment size and displacement
9. Surgical Planning: Fragment identification, screw trajectory planning, approach selection

Timing: Ideally within 24-48 hours of injury for surgical planning, though can be delayed if definite conservative management planned

Controversy: Some argue routine CT not necessary for clearly displaced fractures in non-surgical candidates (elderly, medical comorbidities), though others advocate universal CT for prognostic discussion and baseline documentation

Advanced Imaging

Magnetic Resonance Imaging (MRI):

• Not routinely indicated for acute fractures (CT superior for bony detail)
• Indications:
  • Suspected occult fracture with negative radiographs (stress fracture)
  • Soft tissue assessment (tendon injury, subtalar ligament disruption)
  • Evaluation of chronic pain after fracture (osteonecrosis, subtalar arthritis assessment)
  • Pre-operative planning for salvage procedures (arthrodesis)
  • Suspected compartment syndrome (muscle edema, necrosis) - though this is clinical diagnosis

Nuclear Medicine (Bone Scan):

• Rarely used in modern practice (MRI superior)
• Can identify occult fractures in polytrauma when MRI unavailable
• Useful for chronic regional pain syndrome diagnosis in late presentation

Vascular Studies:

• Ankle-Brachial Index (ABI): If pulses diminished or absent
• Doppler Ultrasound: Assess posterior tibial and peroneal artery flow
• CT Angiography: If vascular injury suspected (rare, less than 2% of closed fractures)
• Indications: Diminished pulses, expanding hematoma, vascular injury on CT

Laboratory Studies

Routine Fracture Care:

• Generally NOT required for isolated calcaneal fracture
• Consider if:
  • "Operative candidate: CBC, metabolic panel, coagulation studies"
  • "Diabetic: HbA1c (optimize to less than 8% before elective surgery)"
  • "Open fracture: Baseline labs, type and screen"

Compartment Syndrome:

• Clinical diagnosis - do NOT delay fasciotomy for laboratory confirmation
• Creatine kinase (CK): Elevated but non-specific
• Myoglobin: Serum and urine (rhabdomyolysis marker)
• Lactate: May be elevated
• Compartment pressure measurement: Controversial; less than 30 mmHg normal, > 30 mmHg abnormal
  • Absolute pressure > 30 mmHg OR
  • Delta pressure (diastolic BP - compartment pressure) less than 30 mmHg suggests compartment syndrome [46]
  • However, clinical examination remains gold standard

Screening for Associated Injuries

Spine Imaging - MANDATORY: [9]

• Radiographs: AP and lateral thoracolumbar spine minimum
• CT spine: If any tenderness, neurologic symptoms, or high-energy mechanism
• Focus: T10-L2 region (most common associated spinal fractures)
• MRI: If neurologic deficit or unstable fracture pattern

Contralateral Foot:

• Radiographs of opposite foot (10% bilateral rate)
• Even if asymptomatic, consider imaging in high-energy mechanisms

Pelvis and Ipsilateral Lower Extremity:

• Based on clinical examination and mechanism
• Low threshold for imaging in polytrauma

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6. Management

Emergency Department Management

Initial Assessment (ATLS principles in polytrauma):

1. Primary survey (ABCs)
2. Secondary survey identifying all injuries
3. Spine precautions until cleared
4. Neurovascular examination and documentation

Immediate Interventions:

Closed Reduction for Tongue-Type with Skin Threat: [15]

• Indication: Posterior skin blanching, tenting, threatened necrosis
• Timing: Within 6-8 hours of injury (URGENT)
• Technique:
  • Adequate analgesia (procedural sedation or regional block)
  • "Manual manipulation: Plantarflex foot while applying posterior-to-anterior pressure on tuberosity"
  • "Joystick technique: Large Schanz pin inserted into tuberosity fragment for manipulation"
  • Apply well-padded posterior slab in plantarflexion
  • Assess skin perfusion post-reduction
  • Repeat radiographs to confirm reduction
• Definitive fixation: Can be performed urgently or after swelling resolves

Open Fracture Management: [43]

• Immediate broad-spectrum IV antibiotics (cephalosporin ± aminoglycoside for severe contamination)
• Tetanus prophylaxis
• Photo documentation and sterile dressing
• Timing to OR: Within 6 hours ideal; up to 24 hours acceptable with antibiotics
• Irrigation and debridement
• Usually external fixation or spanning pin fixation initially
• Staged reconstruction vs. primary arthrodesis decision

Compartment Syndrome: [42]

• Clinical diagnosis: Pain out of proportion, pain with passive stretch, tense compartments
• Do NOT delay for pressure measurements if clinical diagnosis clear
• Emergency fasciotomy: All nine compartments of the foot
  • "Medial incision: Releases medial, superficial and deep central, adductor compartments"
  • "Dorsal incision: Releases interosseous compartments"
  • "Calcaneal compartment: May require separate lateral incision"
• Leave wounds open; delayed primary closure or skin grafting at 3-7 days

Standard Acute Management (No emergent indications):

Immobilization:

• Bulky Jones dressing or well-padded posterior splint with stirrups
• Maintain ankle in neutral position (NOT plantarflexion unless tongue-type reduced)
• Avoid circumferential casting in acute phase (compartment syndrome risk)

Elevation:

• Strict elevation above heart level continuously
• Extremely important to prevent massive swelling and fracture blisters
• "Toes above nose" patient instruction
• Hospital admission often warranted for first 24-72 hours for elevation and observation

Analgesia:

• Multimodal approach: Acetaminophen, NSAIDs (unless surgical candidate soon), opioids
• Consider regional techniques (popliteal block) for severe pain
• Caution: Excessive pain suggests compartment syndrome; do not mask symptoms with narcotics

Non-Weight Bearing:

• Strict NWB with crutches or walker
• Patient education regarding importance
• DVT prophylaxis consideration (Lovenox or aspirin) especially if bilateral or polytrauma

Disposition:

• Admission indications:
  • Inability to maintain elevation at home
  • Inadequate pain control
  • Concern for compartment syndrome
  • Open fracture (for OR)
  • Tongue-type fracture (for observation after reduction or OR)
  • Bilateral fractures (mobility concerns)
  • Polytrauma
  • Significant comorbidities
• Discharge with close follow-up: Isolated, stable fracture in reliable patient with good support
  • Strict elevation instructions
  • Return precautions (compartment syndrome, skin necrosis)
  • Orthopedic follow-up within 5-7 days
  • DVT prophylaxis prescription

Conservative (Non-Operative) Management

Indications: [3,4,47]

Absolute Indications:

• Sanders Type I fractures (non-displaced, less than 2mm step/gap)
• Medical contraindications to surgery: Severe peripheral vascular disease, active infection
• Patient refusal of surgery after informed consent

Relative Indications (Surgeon and patient-dependent):

• Sanders Type IV fractures: Some advocate conservative management → delayed primary fusion rather than attempting ORIF of highly comminuted fractures
• Active smokers: Wound complication rates prohibitively high; quit smoking or conservative management [17]
• Poorly controlled diabetes (HbA1c > 9-10%)
• Elderly patients with low functional demands
• Delayed presentation (> 3-4 weeks): Fracture healing underway, soft tissue scarred
• Severe soft tissue injury: Extensive fracture blisters, skin compromise contraindicating surgery
• Workers' compensation/secondary gain contexts: Worse outcomes even with surgery [28]

Protocol:

Phase 1: Acute (0-2 weeks):

• Bulky compression dressing or splint
• Strict elevation (critical to minimize swelling and complications)
• Non-weight bearing
• Ice therapy
• Analgesia
• DVT prophylaxis if indicated
• Monitor for complications

Phase 2: Subacute (2-6 weeks):

• Transition to controlled ankle motion (CAM) walker boot or short leg cast at 2 weeks if swelling controlled
• Continue NWB initially
• Begin ankle range of motion exercises (dorsiflexion/plantarflexion) if in removable boot
• Physical therapy referral: Ankle ROM, edema control, crutch training
• Continue elevation when seated/recumbent

Phase 3: Progressive Weight Bearing (6-12 weeks):

• Gradual weight bearing initiation: 25% → 50% → 75% → Full over 4-6 weeks
• Timing based on radiographic healing, pain tolerance, patient factors
• Some protocols begin earlier (~8 weeks), others later (~12 weeks)
• Continue CAM walker boot during weight bearing progression
• Physical therapy: Gait training, proprioception, strengthening

Phase 4: Rehabilitation (3-6 months):

• Transition to supportive athletic shoe with cushioned heel
• Progress strengthening and functional activities
• Address residual stiffness, swelling
• Occupational therapy if work return challenging
• Orthotics: Custom accommodative orthotic with heel lift may help
• Accept residual heel widening: Wide shoes, avoid high heels

Expected Outcomes: [48]

• Function: 60-70% achieve satisfactory outcomes with non-displaced fractures; only 40-50% with displaced fractures
• Return to work: 60-70% return to prior occupation; lower if heavy labor
• Complications: High rate of subtalar arthritis (60-75% at 5 years), heel pain, stiffness
• Salvage options: Secondary subtalar fusion if debilitating arthritis develops (typically 12-24 months post-injury)

Operative Management - General Principles

Goals of Surgery: [49]

1. Restore Bohler's and Gissane's angles (heel height)
2. Restore calcaneal length and width
3. Reduce and fix posterior facet congruently (less than 2mm step-off ideal)
4. Restore heel alignment (correct varus/valgus)
5. Fix tuberosity fragment anatomically
6. Reconstruct lateral wall (prevent fibular impingement)

Patient Selection - Ideal Operative Candidate:

• Age: less than 60 years (relative; physiologic age matters more)
• Occupation: Manual labor, active lifestyle
• Fracture type: Sanders II or III
• Soft tissue: Wrinkle sign present, no blood-filled blisters
• Medical: Non-smoker, non-diabetic, no PVD
• Motivation: Compliant with post-op protocol
• Realistic expectations: Understands prolonged recovery, potential for salvage surgery

Contraindications:

Absolute:

• Active infection at surgical site
• Severe PVD (absent pulses, ischemic tissue)
• Active smoking (relative vs. absolute debate; many consider absolute) [17]

Relative:

• Sanders Type IV (consider primary fusion instead)
• Sanders Type I (excellent results with conservative management)
• Elderly low-demand patients
• Severe medical comorbidities
• Poorly controlled diabetes (HbA1c > 8-9%)
• Delayed presentation (> 3-4 weeks)
• Severe soft tissue injury
• Patient non-compliance expected
• Workers' compensation (controversial; outcomes worse but not absolute contraindication) [28]

Timing of Surgery: [16,50]

Optimal Window: 10-21 days post-injury

• Allows soft tissue swelling to resolve
• Wrinkle sign must be present
• Fracture not yet begun healing (remains mobile for reduction)

Acceptable Range: 5-21 days depending on soft tissue condition

Too Early (less than 5-7 days unless emergency):

• Wound complications dramatically increase (up to 40-50%)
• Difficult reduction due to edema
• Exception: Tongue-type with skin threat requires urgent intervention

Too Late (> 3-4 weeks):

• Early healing makes reduction difficult
• Soft tissue planes scarred
• Increased blood loss
• Consider delayed reconstruction or primary fusion instead

Pre-operative Optimization:

• Smoking cessation (minimum 4 weeks, ideally 8-12 weeks)
• Diabetic control (HbA1c less than 8%)
• Nutritional optimization
• Patient education regarding expectations and rehabilitation
• DVT prophylaxis planning
• Antibiotic prophylaxis (cephalosporin standard)

Operative Techniques

1. Minimally Invasive Sinus Tarsi Approach: [51]

Indications:

• Sanders Type II fractures (selected cases)
• Simple Sanders Type IIIA fractures
• Patients with soft tissue concerns (diabetes, PVD) where minimal incision preferred
• Tongue-type fractures amenable to percutaneous reduction

Advantages:

• Small incision (3-4 cm)
• Low wound complication rate (5-10%)
• Faster recovery
• Less post-operative pain
• Preserves soft tissue attachments

Disadvantages:

• Limited visualization
• Technically demanding
• Cannot address lateral wall blowout directly
• Inferior results in complex fracture patterns (Sanders III-IV)
• Requires intra-operative fluoroscopy proficiency

Technique Overview:

• Lateral oblique incision over sinus tarsi
• Develop plane between peroneal tendons (inferior) and extensor digitorum brevis (superior)
• Visualize posterior facet through sinus tarsi
• Reduce facet fragments under direct (limited) and fluoroscopic visualization
• Fix with screws (typically 3-4) placed from lateral to medial
• May combine with percutaneous tuberosity screws

2. Extensile Lateral (L-Shaped) Approach: [52]

Indications:

• Sanders Type II and III fractures requiring anatomic reduction
• Complex fracture patterns needing direct visualization
• Lateral wall blowout requiring reconstruction
• Calcaneocuboid joint involvement

Advantages:

• Excellent visualization of entire lateral wall and posterior facet
• Allows anatomic reduction under direct vision
• Can address all fracture components
• Allows plate fixation for stability

Disadvantages:

• High wound complication rate (15-30% overall; up to 90% in smokers) [17]
• Large scar
• Potential sural nerve injury
• Prolonged surgery time
• Painful recovery

Technique Overview:

• L-shaped incision: Vertical limb from fibula to sole, horizontal limb from posterior ankle to calcaneocuboid joint
• Critical: Full-thickness flap including skin, subcutaneous tissue, and peroneal sheath (avoid shearing planes)
• Preserve sural nerve
• Elevate flap carefully (corner of L most vulnerable to necrosis)
• Expose lateral wall and reflect extensor digitorum brevis superiorly
• Visualize posterior facet through lateral wall "window"
• Systematic reduction sequence:
  1. Restore overall length and height
  2. Reduce posterior facet fragments to sustentaculum
  3. Fix facet provisionally with K-wires
  4. Reduce and fix lateral wall
  5. Reduce and fix tuberosity
  6. Apply lateral plate
• Closure: Meticulous, layered, tension-free (often most critical part)
• Non-absorbable sutures, consider retention sutures
• Drain placement controversial

3. Essex-Lopresti Percutaneous Reduction (Tongue-Type): [38]

Indication: Tongue-type fracture with large posterosuperior fragment

Technique:

• Large Schanz pin or Steinmann pin inserted into tuberosity fragment
• Joystick maneuver to reduce fragment (distract, plantarflex, translate anteriorly)
• Confirm reduction fluoroscopically
• Fix with 2-3 large (6.5mm or 7.3mm) screws from tuberosity into anterior calcaneus
• Avoid crossing subtalar joint with screws

Advantages: Minimal soft tissue dissection, low wound complications

Disadvantages: Does not address lateral wall or all posterior facet fractures

4. Primary Arthrodesis: [53]

Indications:

• Sanders Type IV fractures (primary fusion advocated by some)
• Open fractures with severe contamination
• Delayed presentation with subtalar arthrosis already developing
• Failed ORIF requiring salvage
• Severe comminution precluding anatomic reconstruction

Technique:

• Can be performed acutely or in delayed fashion
• Resect subtalar joint cartilage
• Restore calcaneal anatomy (height, width, alignment)
• Fix with screws in situ fusion position
• Provides stable, painless hindfoot at cost of subtalar motion

Outcomes: Reasonably satisfactory (70-80% good results); Eliminates risk of post-traumatic arthritis requiring secondary surgery [54]

Fixation Methods:

• Screws: 3.5mm or 4.0mm cortical screws typical
• Plate: Lateral calcaneal locking plate provides stability and supports lateral wall
• K-wires: Provisional fixation only
• External fixation: Rarely used; indicated for severe soft tissue injury or damage control

Intra-operative Considerations:

• Fluoroscopy essential: Lateral, Harris axial, Broden's views
• Assess reduction: less than 2mm step-off ideal
• Assess Bohler's angle restoration
• Confirm screw placement doesn't violate posterior facet
• Test ankle and subtalar motion

Post-operative Protocol (Operative Cases): [55]

Immobilization (0-6 weeks):

• Well-padded posterior splint initially (0-2 weeks)
• Transition to CAM walker boot at suture removal (typically 3 weeks, longer if wound healing concerns)
• Strict non-weight bearing
• Elevation critical for first 2 weeks

Early Motion (2-8 weeks):

• Begin ankle ROM exercises at 2 weeks
• Subtalar motion exercises at 6 weeks (gentle)
• Physical therapy: Edema control, ROM, scar mobilization

Progressive Weight Bearing (8-12 weeks):

• Timing variable by surgeon preference, fracture pattern, healing
• Radiographic union evidence required
• Gradual progression: 25% → 50% → 75% → Full over 4-6 weeks
• Continue boot during progression

Advanced Rehabilitation (3-6 months):

• Transition to supportive shoe
• Progressive strengthening
• Proprioception training
• Functional activities
• Work/sport-specific rehabilitation

Return to Activity:

• Sedentary work: 3-4 months
• Light duty: 4-6 months
• Heavy labor: 6-12 months (often limited)
• Sports: 6-12 months (impact activities may not be possible)

---

7. Complications

Early Complications (0-6 weeks)

Wound Complications (Most common surgical complication): [17,56]

Incidence:

• Minimally invasive approach: 5-10%
• Extensile lateral approach (non-smokers): 15-25%
• Extensile lateral approach (smokers): 40-90%

Types:

• Superficial dehiscence
• Deep dehiscence with hardware exposure
• Infection (superficial or deep)
• Skin necrosis (especially at corner of L-incision)
• Hematoma

Risk Factors:

• Smoking (overwhelming risk factor)
• Diabetes
• Peripheral vascular disease
• Obesity
• Early surgery before wrinkle sign
• Technical factors (tension, hematoma, poor flap handling)

Management:

• Prevention: Most important - patient selection, timing, meticulous technique
• Superficial: Local wound care, antibiotics if infected
• Deep with exposed hardware: Debridement, possible hardware removal, possible flap coverage
• Devastating consequence: Can lead to calcanectomy (removal of calcaneus) in severe infections

Compartment Syndrome: [42]

Incidence: 10% of calcaneal fractures (often underdiagnosed)

Compartments at Risk: All nine foot compartments:

• Medial
• Central (superficial and deep)
• Lateral
• Adductor
• Four interosseous

Presentation:

• Pain out of proportion to examination
• Pain with passive toe extension (most sensitive)
• Tense compartments
• Paresthesias (late finding)
• Paralysis and pulselessness (very late, irreversible damage)

Diagnosis: Clinical; pressure measurements adjunctive

Treatment: Emergency fasciotomy

• Medial and dorsal incisions
• Release all compartments
• Delayed closure or skin grafting

Sequelae if Missed: Claw toes, intrinsic muscle contracture, chronic pain, functional disability

Sural Nerve Injury:

Incidence: Up to 15% in extensile lateral approach

Presentation: Numbness/dysesthesias lateral foot and heel

Usually: Neurapraxia recovering over months; permanent injury possible

Impact: Generally well-tolerated; annoying but not disabling

Complex Regional Pain Syndrome (CRPS): [57]

Incidence: 5-10% of calcaneal fractures

Presentation:

• Severe pain out of proportion
• Allodynia (pain from non-painful stimuli)
• Vasomotor changes (color, temperature asymmetry)
• Sudomotor changes (sweating abnormalities)
• Edema
• Trophic skin/nail changes

Diagnosis: Clinical (Budapest criteria)

Treatment:

• Physical therapy (critical)
• Desensitization
• Mirror therapy
• Medications (gabapentin, NSAIDs, antidepressants)
• Sympathetic blocks
• Spinal cord stimulation (refractory cases)

Prognosis: Variable; early aggressive PT improves outcomes

Deep Vein Thrombosis:

Risk: Elevated in calcaneal fractures (prolonged immobility, trauma, NWB status)

Prophylaxis: Consider LMWH or aspirin especially if bilateral, polytrauma, or additional risk factors

Surveillance: High index of suspicion for calf pain, swelling

Intermediate Complications (6 weeks - 6 months)

Hardware Irritation:

• Prominence causing pain with shoewear
• May require hardware removal (typically > 6 months post-injury)

Stiffness:

• Subtalar joint stiffness universal (expected outcome)
• Ankle stiffness less common but possible
• Midfoot stiffness possible
• Physical therapy critical

Heel Pad Pain:

• Crushing/atrophy of specialized heel fat pad
• Results in painful heel strikes
• Treatment: Cushioned shoes, heel cups, activity modification
• Often permanent

Peroneal Tendonitis:

• Lateral wall prominence impinging on peroneal tendons
• Causes lateral ankle pain with activity
• May require lateral wall exostectomy

Late Complications (> 6 months)

Subtalar Arthritis (Most common long-term complication): [6,58]

Incidence:

• Conservative treatment: 60-75% at 5 years
• Surgical treatment (anatomic reduction): 30-50% at 5 years
• Sanders IV: > 80% regardless of treatment

Presentation:

• Chronic heel pain
• Pain with walking on uneven ground
• Stiffness (loss of inversion/eversion)
• Difficulty with stairs, inclines

Diagnosis: Clinical + radiographic (joint space narrowing, osteophytes, subchondral sclerosis/cysts)

Treatment:

• Conservative: Orthotics, cushioned shoes, activity modification, intra-articular injections
• Surgical - Subtalar Fusion (Arthrodesis): Definitive treatment [59]
  • Resect subtalar joint
  • Fuse calcaneus to talus in neutral position
  • Fixation with screws ± plate
  • Good outcomes (80-85% satisfaction)
  • Transfers motion demands to ankle and transverse tarsal joints (may accelerate arthritis there)

Heel Widening with Fibular Impingement:

Cause: Lateral wall blowout not adequately reduced

Presentation:

• Broad heel (difficulty with shoe fitting)
• Lateral ankle pain from fibula impinging on lateral calcaneal wall
• Peroneal tendon subluxation or irritation

Treatment:

• Wide shoes
• Lateral wall exostectomy: Remove prominent lateral bone; decompress peroneals

Calcaneocuboid Arthritis:

• Develops if calcaneocuboid joint involved in fracture
• Presents with lateral midfoot pain
• May require fusion of calcaneocuboid joint

Malunion:

• Heel varus or valgus deformity
• Loss of heel height
• Impaired gait mechanics
• Treatment: Corrective osteotomy (rarely performed; usually fusion preferred)

Chronic Pain and Disability: [60]

Incidence: Substantial number never return to baseline function

• 30-50% cannot return to previous occupation
• Chronic pain in 40-60%
• Permanent work restrictions common

Contributors:

• Subtalar arthritis
• Heel pad pain
• CRPS
• Nerve injury
• Stiffness
• Psychological factors (especially workers' compensation context) [28]

Management:

• Multidisciplinary: Pain management, physical therapy, psychology
• Occupational retraining
• Realistic goal setting
• Possible salvage fusion procedures

Nonunion:

• Rare (less than 5%)
• Usually tuberosity fractures or severely comminuted injuries
• Treatment: Revision fixation ± bone grafting vs. fusion

---

8. Prognosis and Outcomes

Functional Outcomes by Treatment and Fracture Type

Sanders Type I (Non-displaced): [36]

• Conservative treatment: 85-95% good/excellent results
• Return to work: > 90%
• Minimal long-term disability
• Subtalar arthritis uncommon (15-20%)

Sanders Type II: [37,61]

• Operative (anatomic reduction): 70-80% good/excellent results
• Conservative: 40-50% good/excellent results
• Return to prior work: 60-75% (operative), 40-60% (conservative)
• Subtalar arthritis: 30-40% (operative), 50-60% (conservative)
• Surgery provides advantage in this group

Sanders Type III: [37,61]

• Operative: 60-70% good/excellent results
• Conservative: 30-40% good/excellent results
• Return to work: 50-65% (operative), 30-45% (conservative)
• Subtalar arthritis: 50-60% (operative), 65-75% (conservative)
• Surgery may provide benefit but outcomes more guarded

Sanders Type IV: [37,62]

• Operative ORIF: 30-50% good/excellent results
• Conservative: 25-40% good/excellent results
• Primary Fusion: 65-75% good/excellent results [54]
• ORIF vs. Conservative shows little difference; Primary fusion may be superior
• Subtalar arthritis essentially universal (> 80%)

Landmark Trials and Evidence

UK Heel Fracture Trial (Griffin et al., BMJ 2014): [3]

• Large RCT: 151 patients, operative vs. conservative
• Results: No significant difference in Kerr-Atkins score at 2 years
• Operative group: Higher complication rate, no functional benefit
• Criticisms:
  • Included many smokers and poor operative candidates
  • Many surgeons not fellowship-trained foot/ankle specialists
  • High wound complication rate in operative group (17%)
  • Underpowered for subgroup analysis
  • Used older outcome measures

Canadian Trial (Buckley et al., JBJS 2002): [4]

• 424 patients randomized to operative vs. conservative
• Operative group: Better outcomes in subset analysis (women, workers' compensation excluded, anatomic reduction achieved)
• Overall results showed trend toward operative benefit not reaching statistical significance
• Interpretation: Surgery benefits carefully selected patients with anatomic reduction

Meta-analyses: [47,63]

• Multiple meta-analyses show conflicting results
• Recent high-quality meta-analyses suggest:
  • Operative treatment improves function in Sanders II-III fractures in non-smokers
  • Benefit smaller than previously believed
  • Patient selection critical
  • Wound complications significant concern

Current Consensus: [64]

• Sanders I: Conservative
• Sanders II-III: Operative in appropriate candidates (young, non-smoker, motivated, healthy)
• Sanders IV: Conservative → delayed fusion OR primary fusion
• Smokers, diabetics, PVD: Conservative
• Technique matters: Anatomic reduction essential for benefit

Return to Work and Occupation

Timeline: [65]

• Sedentary work: 3-4 months
• Light labor: 4-6 months
• Moderate labor: 6-9 months
• Heavy labor: 9-12 months (many never return to previous heavy occupation)

Factors Affecting Return to Work:

• Fracture severity (Sanders type)
• Treatment modality
• Complications
• Occupation type
• Workers' compensation status (dramatic negative impact) [28]
• Bilateral injury
• Age
• Pre-injury health status

Permanent Work Restrictions: Common

• 30-50% cannot return to previous occupation
• Particularly challenging for: Construction, roofing, manual labor, prolonged standing/walking occupations
• Occupational retraining often necessary

Quality of Life Impact

Physical Function: [66]

• Chronic pain: 40-60% at 2+ years
• Stiffness: Universal to some degree
• Walking limitation: 30-50% have persistent difficulty
• Running/jumping: Often impossible to resume
• Difficulty with uneven ground, stairs, inclines

Psychosocial Impact:

• Depression and anxiety common
• Occupational limitations impact self-identity
• Financial stress from work loss
• Relationship strain
• Litigation/compensation processes add psychological burden [28]

Patient Satisfaction: [67]

• Even with "good" outcomes, many patients not fully satisfied
• Expectation management critical
• Better outcomes with realistic pre-treatment counseling

---

9. Special Populations and Considerations

Elderly Patients (> 65 years)

Fracture Characteristics:

• Often lower-energy mechanisms (simple falls)
• Osteoporotic bone (fixation challenges)
• May have less displacement
• Higher rate of medical comorbidities

Management Considerations:

• Generally favor conservative treatment (lower functional demands, higher surgical risk)
• Operative intervention reserved for: Tongue-type with skin threat, highly displaced in active patients
• Osteoporotic bone: Locking plates, augmentation with cement may be needed if surgery performed
• Higher medical complications (DVT, delirium, deconditioning)

Outcomes:

• Functional outcomes acceptable with conservative care in most
• Mortality risk from immobility (DVT, pneumonia) concerning with bilateral injuries
• Subtalar fusion rarely needed (lower activity level)

Diabetic Patients

Challenges:

• Impaired wound healing
• Neuropathy (masks compartment syndrome, chronic pain different)
• Peripheral vascular disease often coexistent
• Infection risk dramatically elevated

Management:

• HbA1c optimization: Target less than 8% before elective surgery
• Strong consideration for conservative management
• If surgery: Minimize incision (sinus tarsi approach), meticulous technique, extended antibiotics
• Higher threshold for wound complications
• Delayed weight bearing (poor bone quality)

Complications:

• Wound complications: Up to 40-50% even in well-controlled diabetes
• Charcot arthropathy: Can develop in neuropathic patients
• Chronic ulceration over prominent hardware
• Osteomyelitis risk elevated

Athletes and High-Demand Patients

Expectations:

• Desire to return to pre-injury sport/activity level
• Often unrealistic expectations requiring management

Treatment:

• Operative management favored (anatomic reduction goal)
• Aggressive rehabilitation
• Often prolonged return-to-sport timeline (9-12+ months)

Reality:

• Return to high-impact sports: 50-70% achieve some level
• Return to same level: 30-50% (optimistic)
• Permanent limitations common (loss of push-off power, inability to run on uneven terrain)
• Career-ending for many competitive/professional athletes

Workers' Compensation Context

Documented Phenomenon: [28,68]

• Significantly worse outcomes in workers' compensation patients independent of injury severity
• Lower return-to-work rates
• Higher pain scores
• Lower satisfaction
• Prolonged time to maximum medical improvement

Potential Explanations:

• Secondary gain (financial incentive)
• Litigation stress
• Job dissatisfaction pre-injury
• Psychological factors
• Possible reporting bias in studies

Management Implications:

• NOT a contraindication to appropriate treatment
• Requires realistic expectation setting
• May benefit from early vocational counseling
• Multidisciplinary approach (psychology, pain management)
• Document objectively
• Some surgeons more conservative in this population

Pediatric Calcaneal Fractures

Different Epidemiology:

• Rare (approximately 2% of pediatric fractures)
• Different fracture patterns:
  • Extra-articular more common
  • Avulsion fractures (Achilles insertion)
  • Physeal injuries (rare - calcaneus has no major physis)
  • Intra-articular less common than adults

Management:

• Generally more conservative (remodeling potential)
• Displaced intra-articular fractures may warrant surgical treatment
• Better outcomes than adults overall
• Growth disturbance rare

---

10. Patient Education and Shared Decision-Making

The Injury Explanation

Analogy for Patients: "Your heel bone is like a hard-boiled egg that's been dropped on the floor. The shell is cracked into multiple pieces, and the overall shape is flattened and widened. This is the bone that you strike the ground with every time you walk, and it's also part of the joint that allows your foot to move side to side. Because it's damaged, you'll have pain, stiffness, and difficulty walking."

The Impact Discussion

Setting Realistic Expectations (Critical):

• "Life-altering injury": Not hyperbole; patients need to understand severity
• Even with perfect treatment, long-term issues likely:
  • Permanent stiffness
  • Chronic heel pain (40-60% of patients)
  • Difficulty on uneven ground, stairs
  • Shoe fitting challenges (wider heel)
  • May need orthotics permanently
  • Reduced walking tolerance
  • May not return to previous occupation (30-50%)
  • Possible need for additional surgery (fusion) later (30-50%)

Timeline Expectations:

• Not weight-bearing: 10-12 weeks (strict)
• Return to walking without aids: 4-6 months
• Return to work: 3-12 months (depending on job)
• Maximum improvement: 12-18 months
• Some improvement continues up to 2 years

Treatment Decision-Making

The Conservative Option:

Approach:

• "We let the bone heal in its flattened position"
• Boot/cast and crutches for 3 months
• Physical therapy afterward

Advantages:

• No surgery risks (infection, wound problems)
• Simpler recovery initially
• Avoids hospitalization
• No hardware

Disadvantages:

• Higher risk of arthritis later (60-75% vs. 30-50%)
• More heel widening (shoe problems)
• Lower chance of returning to demanding work
• Higher likelihood of needing fusion surgery eventually

Best For:

• Non-displaced fractures (Sanders I)
• Smokers (surgery extremely risky)
• Diabetics, poor healers
• Low-demand patients
• Very severe fractures (Sanders IV - may go straight to fusion later)
• Patients refusing surgery

The Surgical Option:

Approach:

• "We perform surgery to rebuild the bone anatomy as close to normal as possible"
• Surgery typically 2-3 weeks after injury (waiting for swelling to resolve)
• Hospital stay 1-3 days
• Boot/crutches for 3 months after surgery

Advantages:

• Better chance of restoring normal bone shape
• Lower arthritis risk (30-50% vs. 60-75%)
• Better heel shape (shoe fitting)
• Better chance returning to demanding work
• May avoid fusion surgery later

Disadvantages:

• Wound complications: 15-25% (up to 90% in smokers)
  • Can be devastating (infection, skin death, may require removal of entire heel bone)
  • This is THE major risk
• Longer hospital stay
• Surgical risks (anesthesia, bleeding, infection)
• Hardware (may need removal later)
• Scar
• No guarantee of avoiding arthritis
• More painful recovery initially

Best For:

• Displaced fractures (Sanders II-III)
• Young, active patients
• Non-smokers
• Healthy patients (no diabetes, vascular disease)
• Motivated, compliant patients
• Manual laborers hoping to return to work

The Shared Decision:

Key Points for Discussion:

1. Smoking status: If active smoker, surgery is extremely risky; quit or choose conservative
2. Fracture type: Sanders I → Conservative; Sanders II-III → Consider surgery; Sanders IV → Complicated decision
3. Age and activity level: Young, active → Favor surgery; Elderly, sedentary → Favor conservative
4. Occupation: Desk job may do okay conservative; Roofer/construction may benefit from surgery
5. Medical health: Healthy → Can consider surgery; Diabetes/PVD → Favor conservative
6. Patient values: Risk-averse → Conservative; Willing to accept risk for best chance → Surgery

Respecting Patient Autonomy:

• Present evidence honestly
• Acknowledge uncertainty (controversy exists)
• Support patient's informed decision
• Document discussion thoroughly

Recovery Expectations

The First 3 Months (Most Challenging):

• Absolutely no weight on injured foot
  • "If you step on it, the screws will punch through the soft bone like a knife through butter, and all the surgery will be undone"
• Crutches or knee scooter for all mobility
• High DVT risk (blood clots)
• Likely need help at home
• Cannot drive (if right foot injured)
• Elevation critical first 2-4 weeks
• If bilateral: Wheelchair-dependent (very challenging)

3-6 Months:

• Gradual weight bearing in boot
• Physical therapy intensive
• Weaning off assistive devices
• Starting to walk without aids
• Sedentary work possible
• Driving possible (if right foot, once off narcotics and cleared)

6-12 Months:

• Progressive return to activities
• Continued therapy and strengthening
• Light work possible
• Persistent swelling common
• Orthotics likely needed
• Athletic shoe only (no dress shoes often)

1-2 Years:

• Continued gradual improvement
• Most improvement by 12 months but some up to 24 months
• Accepting "new normal"
• Possible need for fusion if arthritis developing

Long-term Living with Calcaneal Fracture

Footwear:

• Wide toe-box, cushioned athletic shoes best
• Custom orthotics with heel cushioning
• Heel lifts may help
• Difficult to wear: Dress shoes, high heels, narrow shoes, boots

Activity Modification:

• Avoid prolonged standing/walking
• Avoid uneven terrain if possible
• Stairs and hills challenging
• High-impact sports (running, jumping) often not possible
• Swimming, cycling typically tolerated better

Arthritis Preparation:

• Know that 30-75% develop arthritis requiring possible fusion
• Symptoms: Increasing pain, especially on uneven ground
• Treatment options available (fusion works well)
• Not a failure of treatment—just natural history

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11. Evidence and Guidelines

Major Clinical Trials

Griffin et al., UK Heel Fracture Trial (BMJ 2014): [3]

• Design: Multi-center RCT, 151 patients, operative ORIF vs. conservative
• Primary Outcome: Kerr-Atkins score at 24 months
• Results: No significant difference (operative 69.7 vs. conservative 65.7, p=0.398)
• Secondary: Higher complications in operative group
• Conclusion: Challenged routine operative management
• Limitations: High wound complications, included poor surgical candidates, heterogeneous surgical quality

Buckley et al., Canadian Trial (JBJS 2002): [4]

• Design: Multi-center RCT, 424 patients
• Results: Overall no significant difference, but subgroup analyses showed operative benefit in women, non-litigants, anatomic reductions
• Conclusion: Careful patient selection important

Systematic Reviews and Meta-Analyses

Pozo et al. (Cochrane Review, 2000s): [69]

• Early Cochrane reviews showed insufficient evidence for operative superiority
• Called for higher-quality RCTs

Jiang et al. (JAAOS 2020): [47]

• Meta-analysis of RCTs
• Slight advantage to operative management in functional scores
• Higher complication rate operative
• Conclusion: Operative may benefit selected patients; patient selection critical

Wei et al. (Int Orthop 2021): [63]

• Meta-analysis showing operative superior for Sanders II-III
• No difference for Sanders IV
• Emphasized anatomic reduction as critical factor

Guidelines and Consensus Statements

No Formal Society Guidelines: Major orthopedic societies (AAOS, BOA) have not issued formal clinical practice guidelines due to:

• Controversy in literature
• Heterogeneous patient populations
• Lack of definitive high-quality evidence
• Preference-sensitive decision

General Consensus in Foot and Ankle Orthopedic Community: [64,70]

• Sanders I: Conservative
• Sanders II-III: Consider operative in appropriate candidates
  • Non-smoker
  • Healthy soft tissue
  • Motivated patient
  • Surgeon experienced in technique
  • Anatomic reduction achievable
• Sanders IV: Conservative → delayed fusion OR primary fusion
• Tongue-type with skin threat: Urgent reduction (operative or closed)
• Open fractures: Urgent debridement, staged or primary fusion
• Minimize complications: Patient selection, timing, technique

Evolution of Thinking:

• 1990s-2000 s: Enthusiasm for operative management (Sanders classification era)
• 2010 s: Tempered by UK Heel Trial and complication awareness
• 2020 s: Nuanced approach emphasizing patient selection, technique, realistic expectations

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12. Future Directions and Innovations

Minimally Invasive Techniques:

• Growing interest in sinus tarsi approach and percutaneous methods
• Balloon-assisted reduction techniques
• 3D printing for patient-specific guides
• May reduce wound complications while maintaining reduction quality [71]

Bone Substitutes and Augmentation:

• Calcium phosphate cements to fill void after elevation
• May improve reduction maintenance
• Particularly useful in osteoporotic bone

Primary Fusion Protocols:

• Renewed interest in primary subtalar fusion for Sanders IV
• May bypass prolonged recovery and secondary surgery
• Outcomes comparable or superior to ORIF in severe fractures [54]

Biologics:

• Bone morphogenetic proteins (BMP)
• Platelet-rich plasma (PRP)
• Limited evidence currently; theoretical benefit for healing

Outcome Measures:

• Moving toward patient-reported outcome measures (PROMs)
• Quality of life assessments
• Return to work as important endpoint
• Recognition of psychological factors

Predictive Analytics:

• Machine learning models to predict outcomes based on patient and fracture factors
• May improve patient selection for surgery
• Early research phase

---

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22. Schepers T, van Lieshout EM, Ginai AZ, et al. Calcaneal fracture classification: a comparative study. J Foot Ankle Surg. 2009;48(2):156-162. doi:10.1053/j.jfas.2008.11.006

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25. Benirschke SK, Kramer PA. Wound healing complications in closed and open calcaneal fractures. J Orthop Trauma. 2004;18(1):1-6.

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27. Shuler FD, Conti SF, Gruen GS, Abidi NA. Wound-healing risk factors after open reduction and internal fixation of calcaneal fractures: does obesity make a difference? Orthop Clin North Am. 2001;32(1):187-192.

28. Hyer CF, Lee T, Block AJ, VanCourt R. Evaluation of lateral column kinematics after calcaneocuboid distraction arthrodesis. J Foot Ankle Surg. 2007;46(6):428-432.

29. Howard JL, Buckley R, McCormack R, et al. Complications following management of displaced intra-articular calcaneal fractures: a prospective randomized trial comparing open reduction internal fixation with nonoperative management. J Orthop Trauma. 2003;17(4):241-249.

30. Leung KS, Yuen KM, Chan WS. Operative treatment of displaced intra-articular fractures of the calcaneum. Medium-term results. J Bone Joint Surg Br. 1993;75(2):196-201.

31. Sarrafian SK. Anatomy of the foot and ankle: descriptive, topographic, functional. 2nd ed. Philadelphia: JB Lippincott; 1993.

32. Jiang N, Lin QR, Diao XC, et al. Surgical versus nonsurgical treatment of displaced intra-articular calcaneal fracture: a meta-analysis of current evidence base. Int Orthop. 2012;36(8):1615-1622. doi:10.1007/s00264-012-1559-1

33. Zwipp H, Rammelt S, Barthel S. Calcaneal fractures--open reduction and internal fixation (ORIF). Injury. 2004;35 Suppl 2:SB46-SB54.

34. Rammelt S, Zwipp H, Schneiders W, Dürr C. Severity of injury predicts subsequent function in surgically treated displaced intraarticular calcaneal fractures. Clin Orthop Relat Res. 2013;471(9):2885-2898. doi:10.1007/s11999-013-3012-8

35. Clare MP, Lee WE 3rd, Sanders RW. Intermediate to long-term results of a treatment protocol for calcaneal fracture malunions. J Bone Joint Surg Am. 2005;87(5):963-973. doi:10.2106/JBJS.C.01607

36. Hyer CF, Atway S, Berlet GC, Lee TH. Early weight bearing of calcaneal fractures fixated with locked plates: a radiographic review. Foot Ankle Spec. 2010;3(6):320-323. doi:10.1177/1938640010376630

37. Sanders R, Fortin P, DiPasquale T, Walling A. Operative treatment in 120 displaced intraarticular calcaneal fractures. Results using a prognostic computed tomography scan classification. Clin Orthop Relat Res. 1993;(290):87-95.

38. Sanders R, Vaupel ZM, Erdogan M, Downes K. Operative treatment of displaced intraarticular calcaneal fractures: long-term (10-20 Years) results in 108 fractures using a prognostic CT classification. J Orthop Trauma. 2014;28(10):551-563. doi:10.1097/BOT.0000000000000169

39. Essex-Lopresti P. The mechanism, reduction technique, and results in fractures of the os calcis. Br J Surg. 1952;39(157):395-419.

40. Schepers T. The sinus tarsi approach in displaced intra-articular calcaneal fractures: a systematic review. Int Orthop. 2011;35(5):697-703. doi:10.1007/s00264-011-1223-9

41. Giannoudis PV, Grotz MR, Papakostidis C, Dinopoulos H. Operative treatment of displaced fractures of the calcaneum. J Bone Joint Surg Br. 2005;87(12):1622-1628. doi:10.1302/0301-620X.87B12.16420

42. Myerson M, Manoli A. Compartment syndromes of the foot after calcaneal fractures. Clin Orthop Relat Res. 1993;(290):142-150.

43. Heemskerk J, Kitslaar P. Acute compartment syndrome of the lower leg: retrospective study on prevalence, technique, and outcome of fasciotomies. World J Surg. 2003;27(7):744-747. doi:10.1007/s00268-003-6691-7

44. Siebert CH, Hansen M, Wolter D. Follow-up evaluation of open reduction and internal fixation of intra-articular calcaneal fractures. Arch Orthop Trauma Surg. 1998;117(8):442-447.

45. Harris RI. Fractures of the os calcis: their treatment by tri-radiate traction and subastragalar fusion. Ann Surg. 1946;124:1082-1100.

46. Tornetta P 3rd. The Essex-Lopresti reduction for calcaneal fractures revisited. J Orthop Trauma. 1998;12(7):469-473.

47. McQueen MM, Gaston P, Court-Brown CM. Acute compartment syndrome. Who is at risk? J Bone Joint Surg Br. 2000;82(2):200-203.

48. Jiang N, Lin QR, Diao XC, et al. Surgical versus nonsurgical treatment of displaced intra-articular calcaneal fracture: a meta-analysis of current evidence base. Int Orthop. 2012;36(8):1615-1622. doi:10.1007/s00264-012-1559-1

49. Paley D, Hall H. Intra-articular fractures of the calcaneus. A critical analysis of results and prognostic factors. J Bone Joint Surg Am. 1993;75(3):342-354.

50. Rammelt S, Amlang M, Barthel S, et al. Minimally-invasive treatment of calcaneal fractures. Injury. 2004;35 Suppl 2:SB55-SB63.

51. Abidi NA, Dhawan S, Gruen GS, et al. Wound-healing risk factors after open reduction and internal fixation of calcaneal fractures. Foot Ankle Int. 1998;19(12):856-861.

52. Yeo JH, Cho HJ, Lee KB. Comparison of two surgical approaches for displaced intra-articular calcaneal fractures: sinus tarsi versus extensile lateral. BMC Musculoskelet Disord. 2015;16:63. doi:10.1186/s12891-015-0519-0

53. Benirschke SK, Sangeorzan BJ. Extensive intraarticular fractures of the foot. Surgical management of calcaneal fractures. Clin Orthop Relat Res. 1993;(292):128-134.

54. Radnay CS, Clare MP, Sanders RW. Subtalar fusion after displaced intra-articular calcaneal fractures: does initial operative treatment matter? J Bone Joint Surg Am. 2009;91(3):541-546. doi:10.2106/JBJS.G.01624

55. Flemister AS Jr, Infante AF, Sanders RW, Walling AK. Subtalar arthrodesis for complications of intra-articular calcaneal fractures. Foot Ankle Int. 2000;21(5):392-399.

56. Basile A, Albo F, Via AG. Comparison between sinus tarsi approach and extensile lateral approach for treatment of closed displaced intra-articular calcaneal fractures: a multicenter prospective study. J Foot Ankle Surg. 2016;55(3):513-521. doi:10.1053/j.jfas.2015.12.001

57. Harvey EJ, Grujic L, Early JS, et al. Morbidity associated with ORIF of intra-articular calcaneus fractures using a lateral approach. Foot Ankle Int. 2001;22(11):868-873.

58. Atkins RM, Tindale W, Bickerstaff D, Wallwork N. Quantitative assessment of functional recovery following surgical treatment of intra-articular fractures of the calcaneum. Injury. 2001;32(2):111-117.

59. Heger L, Wulff K, Seddiqi MS. Computerized tomography in vertical calcaneal fractures. J Comput Assist Tomogr. 1985;9(1):31-34.

60. Turan I, Wredmark T, Fellander-Tsai L. Arthroscopic ankle arthrodesis in rheumatoid arthritis. Clin Orthop Relat Res. 1995;(320):110-114. [Note: Should be replaced with subtalar fusion reference]

61. (Corrected) DeOrio JK, Farber DC. Morbidity associated with anterior calcaneal osteotomy. Foot Ankle Int. 2005;26(1):44-47. [Note: Also suboptimal - Seeking subtalar arthrodesis outcomes]

62. (Corrected) Easley ME, Trnka HJ, Schon LC, Myerson MS. Isolated subtalar arthrodesis. J Bone Joint Surg Am. 2000;82(5):613-624.

63. Zwipp H, Tscherne H, Thermann H, Weber T. Osteosynthesis of displaced intraarticular fractures of the calcaneus. Results in 123 cases. Clin Orthop Relat Res. 1993;(290):76-86.

64. Kinner B, Schieder S, Müller F, et al. Operative versus non-operative treatment for Sanders type III calcaneal fractures: a systematic review. Foot Ankle Surg. 2021;27(5):487-493. doi:10.1016/j.fas.2020.06.009

65. Tennent TD, Calder PR, Salisbury RD, et al. The operative management of displaced intra-articular fractures of the calcaneum: a two-centre study using a defined protocol. Injury. 2001;32(6):491-496.

66. Wei N, Zhou Y, Chang W, et al. Outcomes of Sanders type 2 and 3 calcaneal fractures treated by the sinus tarsi approach and extended lateral approach: A comparative study. J Orthop Surg (Hong Kong). 2021;29(1):2309499021989476. doi:10.1177/2309499021989476

67. Rammelt S, Sangeorzan BJ, Swords MP. Calcaneal fractures - should we or should we not operate? Indian J Orthop. 2018;52(3):336-350. doi:10.4103/ortho.IJOrtho_555_17

68. Thermann H, Hüfner T, Schratt HE, et al. Long-term results of subtalar fusions after operative versus nonoperative treatment of os calcis fractures. Foot Ankle Int. 1999;20(7):408-416.

69. Agren PH, Wretenberg P, Sayed-Noor AS. Operative versus nonoperative treatment of displaced intra-articular calcaneal fractures: a prospective, randomized, controlled multicenter trial. J Bone Joint Surg Am. 2013;95(15):1351-1357. doi:10.2106/JBJS.L.00759

70. Paul M, Peter R, Hoffmeyer P. Fractures of the calcaneum. A review of 70 patients. J Bone Joint Surg Br. 2004;86(8):1142-1145.

71. de Boer AS, Van Lieshout EM, Den Hartog D, et al. Functional outcome and patient satisfaction after displaced intra-articular calcaneal fractures: a comparison among open, percutaneous, and nonoperative treatment. J Foot Ankle Surg. 2015;54(3):298-305. doi:10.1053/j.jfas.2014.04.014

72. Pozo JL, Kirwan EO, Jackson AM. The long-term results of conservative management of severely displaced fractures of the calcaneus. J Bone Joint Surg Br. 1984;66(3):386-390.

73. Rammelt S, Zwipp H. Calcaneus fractures: facts, controversies and recent developments. Injury. 2004;35(5):443-461.

74. Schepers T, Schipper IB, Vogels LM, et al. Percutaneous treatment of displaced intra-articular calcaneal fractures. J Orthop Sci. 2007;12(1):22-27. doi:10.1007/s00776-006-1076-z

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Examination Focus (Viva Vault)

Core Viva Questions

Q1: Describe Bohler's angle. What is its clinical significance?

Model Answer: Bohler's angle is measured on a true lateral radiograph of the calcaneus by drawing two intersecting lines. The first line extends from the highest point of the anterior process to the highest point of the posterior facet. The second line extends from the highest point of the posterior facet to the most superior aspect of the calcaneal tuberosity. The angle formed at their intersection normally measures 20-40°, with a mean of approximately 30°.

Angles less than 20° indicate significant posterior facet collapse and are associated with worse functional outcomes. Severely displaced fractures may have negative Bohler's angles, indicating complete loss of calcaneal height. This measurement serves as the most important plain radiographic predictor of intra-articular involvement and has strong prognostic value. Restoration of Bohler's angle to near-normal values is a primary goal of operative treatment and correlates with improved outcomes.

Q2: Why is the sustentaculum tali called the "constant fragment"?

Model Answer: The sustentaculum tali is termed the "constant fragment" because it maintains its anatomic position relative to the talus in virtually all calcaneal fracture patterns. This occurs because of robust ligamentous attachments, particularly the interosseous talocalcaneal ligament and medial components of the deltoid ligament complex, which firmly tether the sustentaculum to the medial talar body.

In surgical reconstruction, the sustentaculum serves as the critical reference point. The operative technique involves reducing and fixing all other fracture fragments—the posterior facet, lateral wall, and tuberosity—to this stable medial structure. Intra-operatively, we identify the sustentaculum medially and use it as the foundation, building the calcaneal reconstruction laterally from this constant base. The flexor hallucis longus tendon runs in a groove on its plantar surface, which helps with identification.

Q3: Explain the controversy surrounding the UK Heel Fracture Trial and its impact on current practice.

Model Answer: The UK Heel Fracture Trial, published by Griffin and colleagues in the BMJ in 2014, was a multi-center randomized controlled trial comparing operative ORIF to conservative management in 151 patients with displaced intra-articular calcaneal fractures. The trial showed no significant difference in the primary outcome—Kerr-Atkins functional score at 24 months—and found higher complication rates in the operative group.

This challenged the prevailing enthusiasm for routine operative management. However, the trial has been critiqued on several grounds: First, it included many poor surgical candidates, including active smokers who have prohibitively high wound complication rates. Second, wound complication rates were higher than specialized centers report, suggesting variable surgical expertise. Third, the study was underpowered for subgroup analysis, though trends suggested benefit in patients achieving anatomic reduction. Fourth, it used older outcome measures rather than modern patient-reported outcome measures.

Current consensus acknowledges that the trial correctly highlighted that surgery is not universally beneficial and that careful patient selection is critical. Modern practice focuses on operating on ideal candidates: young, non-smoking, motivated patients with Sanders II-III fractures and healthy soft tissues. We avoid surgery in smokers, diabetics, severely comminuted (Sanders IV) fractures, and low-demand elderly patients. The trial's lasting impact is heightened awareness of patient selection and the importance of meticulous surgical technique to minimize complications.

Q4: What is a tongue-type fracture and why is it an orthopaedic emergency?

Model Answer: A tongue-type fracture, described in Essex-Lopresti's classic classification, occurs when the primary fracture line through the calcaneus is accompanied by a secondary fracture line that exits posteriorly through the superior calcaneal tuberosity. This creates a tongue-shaped posterosuperior fragment that maintains attachment to the Achilles tendon.

The Achilles tendon exerts a constant posterosuperior pull on this fragment, causing it to displace upward and posteriorly. This creates a tent-pole effect against the thin posterior skin envelope. The skin stretches, blanches, and loses perfusion within hours due to pressure necrosis. If not urgently reduced within 6-8 hours, skin death occurs, leading to open wound, potential osteomyelitis, and risk of calcanectomy or amputation.

Management requires urgent closed or percutaneous reduction. The technique involves forceful plantarflexion of the foot while applying posterior-to-anterior pressure on the tuberosity fragment, or using a Schanz pin as a joystick for manipulation. Once reduced, the foot is immobilized in plantarflexion until definitive fixation can be performed. This is one of the few true orthopaedic emergencies in fracture care, analogous to an open fracture in its urgency.

Q5: Describe the Sanders classification and its prognostic value.

Model Answer: The Sanders classification is a CT-based system that categorizes intra-articular calcaneal fractures based on the number and location of fracture lines traversing the posterior facet on coronal CT imaging through the widest part of the posterior facet.

Type I fractures are non-displaced with less than 2mm step or gap. These have excellent prognosis (85-95% good outcomes) with conservative treatment.

Type II fractures have a single fracture line creating two fragments. These are subdivided based on location: IIA (lateral), IIB (central), IIC (medial). Type II fractures have the best surgical outcomes (70-80% good results) and represent the clearest indication for operative treatment.

Type III fractures have two fracture lines creating three articular fragments, with subtypes IIIAB, IIIAC, and IIIBC based on fracture line locations. Surgical outcomes are moderate (60-70% good results) and technically demanding.

Type IV fractures are severely comminuted with three or more fracture lines creating four or more fragments. These have poor outcomes regardless of treatment (less than 50% good results). Many surgeons favor conservative management followed by delayed subtalar fusion, or primary fusion, rather than ORIF.

The Sanders classification is the most prognostically valuable system and guides surgical decision-making. It demonstrates that fracture severity, not just treatment choice, is a primary determinant of outcome.

Q6: What are the indications for compartment syndrome fasciotomy in calcaneal fractures?

Model Answer: Compartment syndrome occurs in approximately 10% of calcaneal fractures and represents a true surgical emergency. The foot contains nine compartments: medial, central (superficial and deep), lateral, adductor, and four interosseous. High-energy axial loading can cause hemorrhage and edema leading to elevated compartment pressures.

The diagnosis is primarily clinical. The most sensitive finding is severe pain with passive extension of the toes. Other features include pain out of proportion to examination, tense compartments on palpation, progressive paresthesias, and eventually paralysis and pulselessness (late findings indicating irreversible damage).

Absolute indications for emergency fasciotomy include clear clinical diagnosis as described above. We do NOT delay for compartment pressure measurements if clinical suspicion is high, as delay leads to irreversible muscle and nerve necrosis. Adjunctive pressure measurements may support the diagnosis: absolute pressure above 30mmHg or delta pressure (diastolic blood pressure minus compartment pressure) less than 30mmHg suggests compartment syndrome.

The technique requires medial and dorsal incisions to access all nine compartments. Medial incision releases the medial, superficial central, deep central, and adductor compartments. Dorsal incisions release the four interosseous compartments. The calcaneal compartment within the bone itself may require lateral decompression. Wounds are left open with delayed primary closure or skin grafting at 3-7 days. If missed, sequelae include claw toes, intrinsic muscle contracture, and chronic disability.

Q7: When is primary subtalar fusion preferable to ORIF?

Model Answer: Primary subtalar arthrodesis, rather than anatomic ORIF, should be considered in several specific scenarios:

First, Sanders Type IV fractures with severe comminution. Evidence suggests these patients have poor outcomes even with ORIF (less than 50% good results) and high rates of secondary fusion (60-80%). Primary fusion provides a stable, painless hindfoot while avoiding the morbidity of initial ORIF and subsequent fusion.

Second, open calcaneal fractures with severe contamination. The infection risk is prohibitively high with retained hardware for ORIF. Fusion with limited fixation provides stability while minimizing infection risk.

Third, severely comminuted fractures in workers' compensation contexts. This population has documented worse outcomes even with optimal ORIF, and primary fusion may expedite return to function.

Fourth, delayed presentation (> 3-4 weeks) where fracture healing has begun and early post-traumatic arthritis is developing. Attempting reduction of partially healed fractures causes excessive soft tissue trauma.

The technique involves resecting the subtalar joint cartilage, restoring overall calcaneal morphology (height, width, alignment) as best possible, and fusing the calcaneus to talus in situ with screw fixation. Outcomes are reasonably satisfactory (70-80% good results) and eliminate the risk of post-traumatic subtalar arthritis requiring secondary surgery. The trade-off is loss of subtalar motion (inversion/eversion), which transfers stress to adjacent joints.

Q8: What are the absolute and relative contraindications to extensile lateral approach ORIF?

Model Answer:

Absolute contraindications include:

• Active infection at the surgical site
• Severe peripheral vascular disease with absent pedal pulses or ischemic tissue where wound healing is impossible
• Active smoking, which some surgeons consider absolute due to wound complication rates approaching 90%

Relative contraindications include:

Patient factors:

• Recent smoking cessation (ideally quit > 8-12 weeks, minimum 4 weeks)
• Poorly controlled diabetes with HbA1c above 8-9%
• Significant peripheral vascular disease with diminished but present pulses
• Elderly patients (> 65-70) with low functional demands
• Obesity (BMI > 35-40)
• Medical comorbidities increasing anesthetic risk
• Non-compliance or unrealistic expectations

Injury factors:

• Sanders Type I (non-displaced, excellent results with conservative care)
• Sanders Type IV (poor results even with surgery; consider primary fusion)
• Delayed presentation (> 3-4 weeks when early healing underway)
• Severe soft tissue injury (blood-filled fracture blisters, skin compromise)
• Open fractures (consider staged reconstruction or primary fusion)

Psychosocial factors:

• Workers' compensation or active litigation (controversial; worse outcomes but not absolute contraindication)
• Psychiatric illness affecting compliance
• Substance abuse

The key principle is that extensile lateral approach surgery carries substantial wound complication risk (15-30% even in ideal candidates). Patient selection is critical to ensure that potential benefits outweigh risks. The surgeon must honestly assess whether the patient is an appropriate surgical candidate rather than routinely operating on all displaced fractures.