Supracondylar Humerus Fracture (Paediatric)

1. Overview

Supracondylar humerus fractures represent the most common elbow fracture in children, accounting for 50-60% of all paediatric elbow injuries and approximately 3% of all paediatric fractures. [1,2] These fractures occur in the distal humerus, proximal to the condyles but distal to the humeral epicondyles, typically following a fall onto an outstretched hand (FOOSH) with the elbow in hyperextension. The injury is most prevalent in children aged 5-8 years, with a slight male predominance. [3]

The clinical significance of supracondylar fractures extends beyond the immediate skeletal injury due to the intimate relationship between the fracture site and critical neurovascular structures. The brachial artery, median nerve (particularly the anterior interosseous nerve branch), radial nerve, and ulnar nerve all lie in close proximity to the distal humerus, making them vulnerable to injury during the initial trauma or subsequent displacement. [4,5] The reported incidence of associated neurovascular complications ranges from 10-20% in displaced fractures, with nerve injuries being more common than vascular injuries. [6]

This injury constitutes a true orthopaedic emergency when associated with vascular compromise, as delayed recognition and treatment can lead to devastating complications including Volkmann's ischaemic contracture, characterized by permanent flexion contracture of the wrist and fingers due to irreversible muscle necrosis. [7] The management approach is dictated by the Gartland classification system, which stratifies fractures based on displacement and guides treatment decisions ranging from simple immobilization for undisplaced fractures to urgent closed reduction and percutaneous pinning (CRPP) for completely displaced injuries. [8]

2. Epidemiology

Demographics and Incidence

Supracondylar humerus fractures demonstrate distinct epidemiological patterns that inform clinical suspicion and resource allocation. The peak incidence occurs between ages 5 and 8 years, corresponding to a period of increased physical activity combined with relatively thin supracondylar bone structure and ligamentous laxity permitting hyperextension. [9] The fracture is rare in children under 3 years of age and uncommon after skeletal maturity due to progressive thickening of the supracondylar region. [1]

Annual incidence rates are estimated at 177.3 per 100,000 children, with boys affected approximately 1.5-2 times more frequently than girls. [10] Seasonal variation is observed, with peak incidence during late spring and summer months when outdoor recreational activities increase. [2] The non-dominant extremity is more commonly injured, likely reflecting the tendency to extend the non-dominant arm protectively during a fall. [3]

Mechanism of Injury

Extension-type fractures account for 95-98% of all supracondylar fractures. [11] The typical mechanism involves a fall onto an outstretched hand with the elbow in full or near-full extension. As the olecranon impacts the olecranon fossa, the thin supracondylar bone fails in tension anteriorly and compression posteriorly, resulting in posterior displacement of the distal fragment. The magnitude of displacement correlates with the energy of impact and the degree of hyperextension at the moment of injury.

Flexion-type fractures are uncommon (2-5% of cases) and result from a direct blow to the posterior aspect of a flexed elbow, driving the olecranon anteriorly and causing anterior displacement of the distal fragment. [12] These injuries are associated with a higher risk of ulnar nerve injury due to the proximity of the nerve in the cubital tunnel during elbow flexion.

Risk Factors

3. Anatomy and Pathophysiology

Surgical Anatomy of the Distal Humerus

The supracondylar region of the humerus is characterized by two vertical columns—the medial and lateral—connected by thin intervening bone forming the olecranon and coronoid fossae anteriorly and posteriorly respectively. This architectural arrangement creates a mechanically weak zone susceptible to fracture under bending and rotational forces. [13]

The anterior anatomy is critical for understanding neurovascular injury patterns:

• Brachialis muscle: Originates from the anterior humeral shaft and inserts on the coronoid process. The distal fibers may be pierced by the proximal fragment in displaced fractures, entrapping the brachial artery and median nerve.

• Brachial artery: Runs in the medial aspect of the antecubital fossa, passing anterior to the brachialis muscle. The artery is relatively fixed at two points—proximally at the inferior border of teres major and distally at its bifurcation into radial and ulnar arteries. This tethering makes the vessel vulnerable to stretch injury, kinking, or direct penetration by bone fragments. [14]

• Median nerve: Travels alongside the brachial artery through the antecubital fossa. The anterior interosseous nerve (AIN), a pure motor branch arising 5-8 cm distal to the lateral epicondyle, is the most commonly injured nerve in supracondylar fractures. [15]

• Radial nerve: Courses laterally around the humeral shaft in the spiral groove before piercing the lateral intermuscular septum approximately 10 cm proximal to the lateral epicondyle. It divides into superficial and deep (posterior interosseous) branches at the level of the radiocapitellar joint.

• Ulnar nerve: Runs posteromedially in the cubital tunnel formed by the medial epicondyle and olecranon. While protected in extension-type fractures, it is at significant risk in flexion-type injuries and during medial pin placement. [16]

Biomechanics of Injury

During a FOOSH injury with the elbow extended, several sequential events occur:

1. Axial loading: Initial compression forces are transmitted through the extended forearm to the distal humerus.

2. Hyperextension moment: Continued forward momentum of the body creates a hyperextension moment at the elbow, driving the olecranon into the olecranon fossa.

3. Failure pattern: The thin supracondylar bone fails first in tension anteriorly (where the bone is thinnest), then propagates posteriorly in compression.

4. Displacement: The pull of the triceps muscle and continued body momentum displace the distal fragment posteriorly and proximally. The proximal fragment is driven anteriorly by the brachialis muscle, potentially penetrating the muscle and endangering the neurovascular bundle.

5. Rotation: Rotational forces may cause the distal fragment to rotate into varus (posteromedial displacement) or valgus (posterolateral displacement), with important implications for specific nerve injuries. [17]

Classification: The Gartland System

The Gartland classification remains the most widely used system for stratifying supracondylar fractures and guiding treatment. [8] Modified by Wilkins, the current system includes:

Type I: Undisplaced or Minimally Displaced

• No visible displacement on AP or lateral radiographs
• Anterior humeral line intersects the middle third of the capitellum
• Posterior fat pad sign may be the only radiographic finding
• Intact periosteal hinge
• Treatment: Long-arm cast immobilization at 90° flexion for 3-4 weeks
• Complication rate: less than 1%

Type II: Displaced with Intact Posterior Cortex

• Visible displacement on radiographs
• Posterior cortex remains intact, functioning as a hinge
• Anterior humeral line passes anterior to or through the anterior third of the capitellum

Subdivided into:

• Type IIA: No rotational deformity; angular displacement only
• Type IIB: Rotational deformity present in addition to angulation

Treatment considerations:

• Type IIA with acceptable alignment: Long-arm cast
• Type IIB or unacceptable alignment: CRPP
• Complication rate: 5-10%

Type III: Completely Displaced

• Complete loss of cortical contact
• No intact periosteal hinge
• High risk of neurovascular injury

Subdivided by displacement pattern:

• Type IIIA: Posteromedial displacement → radial nerve at risk
• Type IIIB: Posterolateral displacement → median nerve/brachial artery at risk (more common)

Treatment: Urgent CRPP Complication rate: 10-20%

Type IV: Multidirectional Instability (Leitch modification)

• Periosteum disrupted circumferentially
• Unstable in both flexion and extension
• Highest risk of neurovascular injury and difficulty achieving stable reduction
• Treatment: CRPP, often requiring crossed pin configuration
• Complication rate: 20-30%

4. Clinical Presentation

History

Parents typically report that the child fell onto an outstretched hand, often while running, jumping, or playing on playground equipment. The mechanism should be clearly documented, with particular attention to:

• Height of fall: Higher energy injuries are associated with greater displacement
• Surface landed on: Hard surfaces increase fracture displacement
• Time since injury: Delayed presentation increases risk of compartment syndrome
• Immediate symptoms: Immediate severe pain and inability to move the arm are characteristic

Symptoms

Physical Examination

A systematic examination must document neurovascular status before and after any manipulation. The examination should be performed gently to minimize further displacement and patient distress.

Inspection

• Deformity: Extension-type fractures produce an S-shaped deformity with prominence posteriorly (distal fragment) and anteriorly (proximal shaft)
• Swelling: Circumferential swelling around the elbow; may extend to forearm and arm
• Ecchymosis: May develop over 12-24 hours
• Pucker sign: A critical finding—dimpling of the anterior skin indicating perforation of the brachialis muscle by the proximal fragment, with high probability of neurovascular entrapment [18]
• Open wounds: Rare but require immediate antibiotics and surgical debridement

Palpation

• Tenderness: Maximal over the distal humerus
• Crepitus: May be palpable with gentle movement
• Posterior prominence: The olecranon may be prominent posteriorly in displaced fractures

Neurovascular Assessment

This is the most critical component of the examination and must be thoroughly documented.

Vascular Assessment:

1. Radial pulse palpation: Assess for presence, strength, and symmetry with contralateral side
2. Capillary refill: Normal is less than 2 seconds
3. Hand perfusion: Assess temperature, color, and turgor
4. Pulse oximetry: Can provide objective measurement if available

Clinical Categories:

Motor Nerve Assessment:

The child's cooperation may be limited by pain, but effort should be made to document each nerve:

1. Anterior Interosseous Nerve (AIN) - Branch of median nerve

   • Test: Ask child to make "OK" sign (thumb tip to index finger tip, forming circle)
   • Positive finding: Inability to flex interphalangeal joint of thumb and distal interphalangeal joint of index finger (child makes "pinch" instead of "circle")
   • Frequency: Most common nerve injury (10-20% of displaced fractures) [19]
   • Significance: Usually neuropraxia; 90% resolve spontaneously in 3-6 months

2. Radial Nerve (Posterior Interosseous Branch)

   • Test: Wrist extension, thumb extension ("thumbs up" sign), finger extension at MCPJs
   • Positive finding: Wrist drop, inability to extend thumb or fingers
   • Associated pattern: Type IIIA (posteromedial displacement)

3. Median Nerve (Main trunk)

   • Test: Thumb opposition (touch thumb to small finger), thenar muscle bulk
   • Positive finding: Weak thumb opposition, thenar wasting (late)
   • Note: Less commonly injured than AIN branch

4. Ulnar Nerve

   • Test: Finger abduction/adduction ("spread fingers apart"), Froment's sign
   • Positive finding: Weakness of interossei, positive Froment's sign
   • Associated patterns: Flexion-type fractures, iatrogenic (medial pin placement)

Sensory Nerve Assessment:

While less reliable in distressed children, document when possible:

• Radial nerve: Sensation in first dorsal web space
• Median nerve: Volar tip of index finger
• Ulnar nerve: Volar tip of little finger

Compartment Syndrome Surveillance:

High suspicion in:

• Ipsilateral forearm fractures ("floating elbow")
• Prolonged time to reduction (> 8 hours)
• High-energy mechanisms
• Vascular injury requiring repair

Clinical hallmarks:

• Pain out of proportion to clinical findings
• Pain on passive stretch of fingers (most sensitive early finding)
• Tense, swollen forearm
• Progressive neurological deficit
• Absent pulses (late, pre-necrotic finding)

5. Differential Diagnosis

While clinical history and mechanism usually suggest supracondylar fracture, other elbow injuries should be considered:

Primary Differentials

Radiographic Differentiation

Key anatomical relationships to assess:

1. Anterior Humeral Line: On lateral radiograph, draw a line along the anterior cortex of the humerus distally. Normally passes through the middle third of the capitellum. In supracondylar fractures with extension deformity, this line passes through the anterior third or anterior to the capitellum entirely.

2. Radiocapitellar Line: On all views, a line through the center of the radial shaft should pass through the center of the capitellum. Disruption suggests radial head dislocation.

3. Posterior Fat Pad Sign: Elevation of the posterior fat pad is always pathological and indicates joint effusion, suggesting intra-articular or peri-articular fracture even if no fracture line is visible.

4. Baumann's Angle: Measured on AP radiograph between the long axis of the humeral shaft and a line through the lateral condyle physis. Normal range: 64-81° (mean 72°). Useful for assessing varus/valgus angulation and comparing with contralateral side.

6. Investigations

Radiographic Imaging

Standard views: AP and lateral radiographs of the elbow are sufficient for diagnosis and classification in most cases.

AP Radiograph Assessment:

• Fracture line position (supracondylar)
• Displacement (medial vs lateral)
• Baumann's angle (assess for varus/valgus)
• Associated fractures (medial/lateral epicondyle)

Lateral Radiograph Assessment:

• Anterior humeral line position
• Degree of posterior displacement
• Rotation (assessed by relationship of condyles)
• Fat pad signs

Comparative Views: Contralateral elbow radiographs may be helpful in subtle cases, particularly in younger children with incomplete ossification, but should not delay treatment in obvious displaced fractures.

Advanced Imaging:

• Computed Tomography (CT): Rarely required; reserved for complex fracture patterns, suspected intra-articular extension, or pre-operative planning for difficult cases

• Magnetic Resonance Imaging (MRI): Not routinely indicated; may have role in assessing vascular injury or late complications

• Ultrasound: Can identify occult fractures in young children by demonstrating joint effusion and periosteal elevation; operator-dependent

• Angiography: Historically used for vascular assessment, now largely replaced by clinical examination and intra-operative assessment. May still have role in documented arterial injury requiring vascular surgery consultation [20]

Laboratory Investigations

Generally not required for isolated supracondylar fracture. Consider in specific scenarios:

• Complete Blood Count: If significant blood loss, pre-operative assessment
• Coagulation Studies: History of bleeding disorder, anticoagulant use
• Creatine Kinase: If compartment syndrome suspected (elevated in muscle necrosis)
• Blood Gas Analysis: If vascular repair planned (assess metabolic acidosis from ischaemia)

Pre-operative Assessment

For fractures requiring surgical intervention:

• Anaesthetic review: Airway assessment, fasting status, consent
• Nil by mouth: Appropriate fasting period (emergency surgery may proceed with aspiration precautions)
• Cross-sectional imaging: Only if fracture pattern unclear on plain films

7. Management

Initial Emergency Department Management

Immediate stabilization (all patients):

1. Analgesia: Appropriate weight-based analgesia

   • Paracetamol: 15 mg/kg PO/IV every 6 hours
   • Ibuprofen: 10 mg/kg PO every 8 hours (if no contraindication)
   • Opioids: Morphine 0.1-0.2 mg/kg IV/IM for severe pain

2. Neurovascular examination and documentation: Before any intervention

3. Immobilization:

   • Above-elbow backslab
   • Elbow flexed to 20-30° (avoid excessive flexion which may compromise vascularity)
   • Forearm in neutral rotation
   • Repeat neurovascular examination after splinting

4. Elevation: Arm elevated to reduce swelling

5. Ice application: 20 minutes on, 20 minutes off (protect skin)

6. NPO status: Anticipate surgery

Reduction attempts in Emergency Department:

Generally not recommended in modern practice due to:

• Risk of further neurovascular injury
• Inadequate analgesia/sedation
• Loss of "one chance" at optimal reduction
• High re-displacement rates without immediate pinning

Exception: Vascular emergency (white pulseless hand) where OR availability is delayed > 1-2 hours—gentle traction-reduction attempt may be necessary.

Treatment Algorithm by Gartland Type

Type I: Undisplaced Fractures

Treatment: Non-operative

• Long-arm cast with elbow at 90° flexion
• Forearm in neutral rotation (some advocate pronation to tighten interosseous membrane)
• Duration: 3-4 weeks
• Follow-up radiographs at 5-7 days to confirm no displacement

Outcomes: Excellent; union rate > 99%; complication rate less than 1%

Type II: Displaced with Intact Posterior Cortex

Treatment decision based on sub-classification:

Type IIA (no rotation):

• If acceptable alignment (anterior humeral line through anterior 1/3 of capitellum or better): Long-arm cast
• If unacceptable alignment: CRPP

Type IIB (rotation present):

• CRPP recommended for all cases
• Rotational deformity does not remodel and leads to cubitus varus

Surgical technique:

• Closed reduction
• Percutaneous pinning (usually 2 lateral divergent pins)
• Post-operative long-arm cast or posterior splint

Type III & IV: Completely Displaced

Treatment: Urgent closed reduction and percutaneous pinning (CRPP)

Timing considerations:

• Emergent (less than 2 hours): White pulseless hand, open fracture, compartment syndrome
• Urgent (6-12 hours): Displaced fracture with vascular compromise (pink pulseless), tented skin
• Expedited (12-24 hours): Displaced fracture without vascular compromise
• Note: Nighttime vs. morning surgery: Landmark AAOS guideline suggests that operating with a fresh team in daylight may be safer than fatigued overnight team, provided no vascular compromise [21]

Surgical Technique: Closed Reduction and Percutaneous Pinning

Patient Positioning

• Supine position
• Affected arm on radiolucent arm board
• C-arm positioned for AP and lateral imaging
• Ensure adequate access for pin placement

Reduction Technique

Traction-Reduction-Flexion-Pronation sequence:

1. Traction: Apply longitudinal traction with elbow in slight flexion (20-30°) to disimpact fragments and restore length. Assistant provides counter-traction on arm. Duration: 2-3 minutes.

2. Correction of coronal plane deformity:

   • Medial/lateral translation corrected by thumb pressure while maintaining traction
   • Assess with AP fluoroscopy

3. Correction of sagittal plane deformity:

   • Thumb pressure on anterior proximal fragment
   • Direct posterior pressure on olecranon
   • "Milk" soft tissues to free entrapped brachialis

4. Flexion: Gradually flex elbow to 100-120° while maintaining corrective pressure. Flexion locks the reduction by tightening the posterior periosteum and triceps.

5. Pronation (for posterolateral displacement): Pronation of the forearm tightens the interosseous membrane and provides additional stability.

6. Verify reduction:

   • AP view: Medial and lateral columns aligned, Baumann's angle 64-81°, no translation
   • Lateral view: Anterior humeral line through middle third of capitellum, minimal anterior/posterior angulation

Pinning Configurations

Three main configurations are used, each with advantages and risks:

1. Lateral Entry Divergent Pins (Most Common)

• Technique: 2 or 3 smooth K-wires (1.6-2.0 mm) inserted from lateral condyle, diverging medially and proximally
• Entry point: Lateral condyle, approximately 1 cm proximal to the lateral epicondyle
• Trajectory:
  • "Pin 1: Aimed 30-40° medially, engages medial cortex proximally"
  • "Pin 2: Aimed 10-15° medially, parallel to lateral column"
  • "Pin 3 (if needed): Intermediate trajectory"
• Advantages:
  • No risk to ulnar nerve
  • Biomechanically sufficient for most fractures if pins divergent > 30° [22]
  • Preferred by most surgeons
• Disadvantages:
  • Slightly less rotational stability than crossed pins
  • Technically more demanding to achieve divergence

2. Crossed Pin Configuration (Medial + Lateral)

• Technique: One lateral pin + one medial pin
• Lateral pin: As described above
• Medial pin:
  • Inserted with elbow in extension (15-20°) to move ulnar nerve posteriorly
  • Mini-incision recommended to identify and protect ulnar nerve
  • Direct palpation or visualization of nerve reduces iatrogenic injury
• Advantages:
  • Maximum biomechanical stability
  • Superior rotational control
• Disadvantages:
  • Ulnar nerve injury risk 2-5% with percutaneous technique [23]
  • Risk reduced to less than 1% with mini-open technique

3. All Medial Pin Configuration

• Rarely used
• Reserved for unusual fracture patterns or lateral skin/soft tissue contraindications
• Highest ulnar nerve risk

Modern consensus: Start with 2 lateral divergent pins. Add a third lateral pin if stability insufficient. Only use medial pin if stability cannot be achieved with 3 lateral pins, and use mini-open technique. [24]

Pin Fixation and Wound Care

• Bend pins outside the skin (facilitates removal)
• Cut pins 5-10 mm from skin
• Cover pin sites with antiseptic dressing
• Apply well-molded long-arm posterior splint or bivalved cast
• Elbow positioned at 90° flexion (avoid excessive flexion > 100° which may compromise circulation)

Intra-operative Complications

Loss of reduction during pinning:

• Maintain reduction with elbow flexion
• Consider assistant holding reduction
• Pin rapidly once reduction confirmed

Inadequate pin purchase:

• Advance pin to engage far cortex
• Add additional pin
• Consider alternative trajectory

Neurovascular injury during pinning:

• Stop immediately if patient moves or nerve stimulation noted
• Remove pin
• Document neurovascular examination
• Consider alternative trajectory

Management of Specific Scenarios

Pink Pulseless Hand

Definition: Absent radial pulse but warm, pink hand with brisk capillary refill (less than 3 seconds)

Pathophysiology: Brachial artery kinked or compressed but collateral circulation (via anterior and posterior ulnar recurrent arteries) maintains hand perfusion [25]

Management approach:

1. Perform urgent closed reduction and pinning (within 6 hours if possible)
2. Re-assess pulse after reduction
3. If pulse returns (occurs in 70-80% of cases):
   • Observe 24-48 hours with neurovascular observations every 1-2 hours
   • No exploration required
4. If pulse remains absent but hand pink and warm:
   • Admit for observation
   • Serial neurovascular examinations
   • Doppler ultrasonography to confirm arterial flow
   • Do NOT routinely explore—landmark studies show equivalent outcomes with observation vs. exploration provided hand remains well-perfused [26]
5. If hand becomes cool or pale: Proceed to arterial exploration

Evidence base: Badkoobehi et al. (2015) demonstrated that observation of the pink pulseless hand post-reduction resulted in 100% limb salvage with no long-term ischaemic sequelae, compared to historical exploration rates of 20-30% with similar outcomes but higher complication rates. [27]

White Pulseless Hand

Definition: Absent radial pulse with pale, cool hand and poor capillary refill (> 3 seconds)

Pathophysiology: Inadequate collateral compensation; limb-threatening ischaemia

Management approach:

1. Immediate reduction (do not wait for OR if delay > 1-2 hours)
2. Re-assess pulse after reduction
3. If pulse returns: Proceed to pinning and observe as per pink pulseless protocol
4. If pulse remains absent:
   • Proceed immediately to vascular exploration
   • Anterior approach to brachial artery
   • Options:
     • Kinking/spasm: Gentle manipulation, topical papaverine, observation
     • Intimal tear: Repair vs. resection and primary anastomosis
     • Transection: Vein graft interposition (reversed saphenous vein from contralateral leg)
   • Vascular surgery consultation intra-operatively

Timing: "White pulseless hand" represents a surgical emergency. Irreversible muscle ischaemia begins at 6-8 hours; reduction and reperfusion should be achieved within 3-4 hours if possible. [28]

Open Fractures

Incidence: 1-2% of supracondylar fractures

Management:

1. Immediate broad-spectrum IV antibiotics (Cefazolin 50 mg/kg, add Gentamicin 7 mg/kg for heavily contaminated wounds)
2. Tetanus prophylaxis
3. Wound photography and sterile dressing (do NOT repeatedly unwrap to examine)
4. Surgical debridement within 6-12 hours
5. CRPP after debridement
6. Wound management:
   • Clean wounds: Primary closure may be possible
   • Contaminated: Leave open, delayed closure or healing by secondary intention
7. Extended antibiotic course (48-72 hours minimum)

Floating Elbow

Definition: Ipsilateral supracondylar fracture + forearm fracture (radius/ulna)

Significance:

• High risk of compartment syndrome (30-40%) [29]
• Extremely high risk of Volkmann's contracture if compartment syndrome missed
• More difficult reduction and pinning

Management:

• Low threshold for prophylactic fasciotomy
• Fix supracondylar fracture first (restores elbow alignment and facilitates forearm reduction)
• Consider external fixation or plate fixation of forearm fractures if unstable
• Admit to high-dependency unit for intense neurovascular monitoring

Failed Closed Reduction

Definition: Inability to achieve acceptable reduction after 2-3 gentle attempts

Causes:

• Soft tissue interposition (brachialis, periosteum)
• Severe comminution
• Button-holing of proximal fragment through brachialis

Management:

• Open reduction via anterior approach
• Release entrapped soft tissues
• Avoid excessive stripping of periosteum
• Pin fixation as per closed technique
• Higher rate of elbow stiffness and heterotopic ossification

Post-operative Care

Immediate post-operative (0-48 hours):

• Neurovascular observations every 1-2 hours
• Elevate limb
• Monitor for compartment syndrome
• Adequate analgesia
• Discharge criteria: Pain controlled, no neurovascular concerns, family educated on warning signs

Week 1:

• Pin site care (keep clean and dry)
• Wound check at 5-7 days
• Clinical and radiographic assessment of reduction

Week 3-4:

• Pin removal in clinic (no anaesthesia required; quick, minimally painful)
• Cast removal
• Commence gentle active range of motion exercises
• No physiotherapy required in most cases—children regain motion spontaneously

Week 6-8:

• Follow-up examination
• Assess range of motion (expect 80-90% of contralateral side)
• Radiographs to confirm union

Month 3-6:

• Final follow-up
• Assess carrying angle, range of motion, neurovascular recovery
• Discharge if satisfactory

Long-term:

• Annual review until skeletal maturity if cubitus varus or residual deformity present
• Nerve palsies: Follow until recovery (most recover by 3-6 months; if no recovery by 5 months, EMG studies and neurology referral)

8. Complications

Early Complications (0-6 weeks)

Neurovascular Injuries

Management of nerve injuries:

• Document pre-operatively (critical for medicolegal and prognostic purposes)
• Observation: 90% are neuropraxias that resolve spontaneously [31]
• Electromyography (EMG): Perform at 4-6 weeks if no clinical recovery
• Exploration: Consider at 3-5 months if no recovery and EMG shows denervation
• Tendon transfers: For permanent deficits (rare)

Vascular Injuries

Brachial artery injury: 5-10% of Type III fractures [32]

Types:

1. Vasospasm: Temporary; responds to reduction and warm packs
2. Intimal tear: May progress to thrombosis; requires monitoring or repair
3. Laceration/transection: Requires immediate surgical repair
4. Arterial kinking: Resolves with reduction

Assessment:

• Pulse palpation (absent in 100% initially)
• Hand perfusion (color, temperature, capillary refill)
• Doppler ultrasonography
• Arteriography (if exploration planned)

Management: As per pink/white pulseless protocols above

Compartment Syndrome

Incidence:

• Isolated supracondylar fracture: 0.5-1%
• Floating elbow: 30-40%
• After vascular repair: 10-20%

Clinical diagnosis:

• Pain: Out of proportion to clinical findings
• Pain on passive stretch: Most sensitive early sign (pain on passive finger extension)
• Paraesthesias: Late finding
• Paralysis: Pre-necrotic; do NOT wait for this
• Pulselessness: Very late; indicates muscle necrosis already occurring
• Tense compartment: Firm forearm, loss of normal contour

Measurement:

• Intra-compartmental pressure monitoring: Absolute pressure > 30 mmHg OR delta pressure (diastolic BP minus compartment pressure) less than 30 mmHg indicates compartment syndrome [33]

Management:

• Emergent fasciotomy (all volar and dorsal compartments)
• Remove constrictive dressings/casts immediately
• Elevate limb to heart level (not above—reduces arterial perfusion)
• Serial examinations if monitoring
• Do NOT delay—window for salvage is 6-8 hours

Consequences of missed compartment syndrome:

• Volkmann's Ischaemic Contracture: Irreversible muscle necrosis resulting in:
  • Flexion contracture of wrist and fingers
  • Thumb adduction contracture
  • Intrinsic muscle wasting
  • Sensory loss (median nerve distribution)
  • Functional disability (cannot extend fingers or oppose thumb)
• Treatment: Tendon lengthening, muscle slide procedures, free muscle transfers—all have limited success
• Prevention is paramount

Loss of Reduction

Incidence: 3-5% after CRPP

Risk factors:

• Inadequate pin purchase
• Non-divergent lateral pins
• Severe comminution
• Type IV fractures
• Early cast removal

Prevention:

• Achieve adequate pin divergence (> 30°)
• Ensure pins engage far cortex
• Use 3 pins for unstable patterns
• Verify reduction before leaving OR

Management:

• If detected less than 7-10 days: Re-reduction and re-pinning
• If detected > 10 days: Consider accepting deformity vs. open reduction (higher risk of stiffness)

Intermediate Complications (6 weeks - 6 months)

Elbow Stiffness

Incidence: 5-10% (mild); 1-2% (severe)

Risk factors:

• Open reduction
• Prolonged immobilization (> 4 weeks)
• Repeated manipulations
• Heterotopic ossification
• Aggressive physiotherapy

Expected recovery:

• Most children regain 90-100% of motion by 6-12 months with benign neglect
• Avoid aggressive physiotherapy—causes pain, inflammation, and paradoxically worsens stiffness

Management:

• Reassure parents
• Active ROM exercises only (patient-directed)
• Serial examinations
• If significant stiffness persists > 12 months: Consider capsular release (rarely needed)

Pin Site Infection

Incidence: 1-3%

Presentation: Erythema, purulent drainage around pin sites

Management:

• Superficial: Oral antibiotics (Flucloxacillin or Cephalexin), local wound care
• Deep/tracking: Remove pins early (if > 3 weeks post-reduction), IV antibiotics
• Septic arthritis: Rare; requires joint washout

Prevention:

• Careful pin site care
• Pins covered but accessible for cleaning
• Remove pins at 3-4 weeks (earlier if signs of infection)

Late Complications (> 6 months)

Cubitus Varus ("Gunstock Deformity")

Definition: Varus angulation of the elbow, creating a "gunstock" appearance when the arm is extended

Incidence: 5-10% after CRPP; higher after non-operative treatment of displaced fractures [34]

Aetiology:

• Malunion (most common): Medial column collapse, rotational deformity
• Avascular necrosis of trochlea (rare)
• Growth arrest (very rare)

Clinical features:

• Cosmetic deformity (primary concern for patients/families)
• Usually NO functional deficit
• Normal range of motion
• No increased risk of arthritis
• Potential psychological impact (body image)

Measurement:

• Carrying angle: Angle between long axis of humerus and forearm with elbow fully extended and forearm supinated
• Normal: 5-15° valgus (girls > boys)
• Cubitus varus: Neutral or varus angle

Management:

• Observation: Most families accept after reassurance re: function
• Corrective osteotomy: For severe deformity (> 20° difference from contralateral) or patient/family request
  • "Multiple techniques: Lateral closing wedge, dome osteotomy, step-cut osteotomy"
  • "Timing: After age 8-10 years (allows spontaneous remodeling first)"
  • "Risks: Lateral condyle fracture, nerve injury, recurrence"
  • Purely cosmetic correction—not medically necessary

Prevention:

• Anatomic reduction
• Assess rotation intra-operatively (compare medial/lateral column widths on AP fluoroscopy)
• Adequate pin fixation

Cubitus Valgus

Incidence: 1-2% (much less common than varus)

Aetiology: Lateral column collapse, avascular necrosis of lateral condyle

Significance:

• May cause tardy ulnar nerve palsy (ulnar neuropathy developing years after injury due to progressive stretching of nerve)
• Increased risk of elbow instability

Management:

• Monitor for ulnar nerve symptoms
• Corrective osteotomy if progressive or symptomatic

Avascular Necrosis (AVN)

Incidence: less than 1%

Aetiology: Disruption of blood supply to trochlea or capitellum

Presentation: Progressive deformity, pain, limited motion

Diagnosis: Radiographs showing sclerosis, collapse, fragmentation of affected ossification center

Management: Usually observation; deformity may require late corrective osteotomy

Heterotopic Ossification/Myositis Ossificans

Incidence: 1-3%; higher after open reduction

Presentation: Firm mass around elbow, progressive loss of motion

Diagnosis: Radiographs showing extra-articular bone formation

Management:

• Benign neglect
• Avoid aggressive physiotherapy
• Most remodel over 1-2 years
• Excision rarely necessary (if causing mechanical block or nerve compression)

9. Prognosis

Overall Outcomes

The prognosis for paediatric supracondylar fractures is generally excellent with appropriate treatment:

Union rate: > 99% by 4-6 weeks

Range of motion recovery:

• Type I fractures: 95-100% of contralateral by 3 months
• Type II/III fractures after CRPP: 85-95% of contralateral by 6-12 months
• Most children regain full functional motion by 12 months

Return to activities:

• Non-contact activities: 6-8 weeks
• Contact sports: 3 months (after pin removal and radiographic union)
• Full unrestricted activity: 3-4 months

Long-term function:

• 95% of patients have excellent functional outcomes

• Minimal to no long-term disability in properly treated fractures
• Residual deformity (cubitus varus) typically cosmetic only

Prognostic Factors

Outcome Measures

Flynn Criteria: Most widely used system for assessing results

Modern series: 85-95% of Type II/III fractures treated with CRPP achieve excellent or good results by Flynn criteria [35]

10. Prevention and Patient Education

Injury Prevention

Primary prevention focuses on reducing fall risk:

• Appropriate supervision during playground activities
• Padding under climbing equipment
• Age-appropriate activities
• Protective equipment for contact sports (though does not prevent elbow hyperextension injuries)

Parent Education (Pre-discharge Instructions)

Warning signs requiring immediate return to hospital:

1. Neurovascular compromise:

   • Fingers become pale, blue, or very pale
   • Fingers become cold or numb
   • Unable to move fingers
   • Severe pain not relieved by prescribed painkillers

2. Compartment syndrome:

   • Severe pain that gets worse despite pain medication
   • Pain when fingers are gently straightened
   • Feeling of tightness in the forearm
   • Tingling or "pins and needles" that gets worse

3. Cast problems:

   • Cast becomes too tight (cannot fit finger under cast edge)
   • Cast becomes wet or breaks
   • Skin irritation or sores under cast

4. Infection (after pin placement):

   • Fever > 38.5°C
   • Bad smell from cast
   • Pus or discharge visible around pins
   • Increasing pain, redness, or swelling

Home care:

• Elevation: Keep arm elevated above heart level (on pillow) for first 48-72 hours
• Ice: Apply ice pack (wrapped in towel) for 20 minutes every 2-3 hours for first 48 hours
• Finger exercises: Move fingers regularly to maintain circulation
• Cast care: Keep cast dry; no scratching inside cast
• Activity: Rest for first week; gradual return to non-strenuous activities
• School: May return when comfortable (usually 1-2 weeks); no sports for 3 months

Follow-up schedule:

• Week 1: Wound check and radiographs
• Week 3-4: Pin and cast removal
• Week 6-8: Range of motion assessment
• Month 3-6: Final check

Recovery Expectations

Reassure parents:

• Elbow will appear stiff initially—this is normal
• Children spontaneously regain motion over 6-12 months
• No physiotherapy needed in most cases
• Can return to all previous activities once healed
• Nerve palsies recover in 90% of cases within 6 months
• Scars from pins are minimal

11. Key Guidelines and Evidence

Landmark Studies

Gartland (1959): Original classification system that remains the foundation of treatment decisions. [8]

Skaggs et al. (2004): Landmark biomechanical study demonstrating that lateral entry pins, if adequately divergent (> 30°), provide sufficient stability for most supracondylar fractures without the ulnar nerve risk associated with medial pins. [22]

Badkoobehi et al. (2015): Definitively established that observation of the pink pulseless hand post-reduction has equivalent outcomes to routine exploration, with lower complication rates. [27]

Omid et al. (2008): Large multicenter study establishing that crossed pins provide superior biomechanical stability but at cost of 2-5% ulnar nerve injury rate with percutaneous technique. [23]

Society Guidelines

American Academy of Orthopaedic Surgeons (AAOS) Clinical Practice Guideline (2011) [21]:

• Recommendation 1: Delayed operative treatment (next morning) vs. nighttime surgery is appropriate for displaced fractures without vascular compromise (Strength: Moderate)

• Recommendation 2: Pink pulseless hand should be treated with urgent reduction and observation; routine exploration not recommended (Strength: Moderate)

• Recommendation 3: Lateral pin configuration is acceptable for most fractures; crossed pins provide greater stability but have higher complication risk (Strength: Moderate)

British Orthopaedic Association Standards for Trauma (BOAST) Guideline:

• Type III fractures should be reduced within 12-24 hours
• Vascular compromise mandates reduction within 6 hours
• Neurovascular examination must be documented pre- and post-reduction
• Avoid excessive elbow flexion (> 120°) in post-operative immobilization

Evidence Gaps and Controversies

Controversies still debated:

1. Optimal pin configuration: Lateral vs. crossed pins

   • Biomechanical studies favor crossed pins for stability
   • Clinical studies show no difference in re-displacement rates with divergent lateral pins
   • Most surgeons now prefer lateral pins to avoid ulnar nerve risk

2. Need for medial pin: When is 3rd lateral pin insufficient?

   • Type IV fractures with medial comminution may benefit
   • Mini-open medial pin placement reduces nerve injury risk to less than 1%

3. Timing of surgery: Immediate vs. next-day for displaced fractures without vascular compromise

   • No difference in outcomes if surgery within 24 hours
   • Fresh surgical team may be safer than fatigued overnight team

4. Immobilization position: Degree of elbow flexion

   • Traditional teaching: 90° flexion
   • Concern: Excessive flexion (> 120°) may compromise circulation
   • Most surgeons use 90-100° flexion

5. Pink pulseless hand: Observation vs. exploration

   • Modern evidence strongly supports observation post-reduction
   • Historical practice of routine exploration no longer justified

12. Examination Focus (MRCS/FRCS Viva Preparation)

Opening Statement

"Supracondylar humerus fracture is a fracture of the distal humerus proximal to the condyles but distal to the epicondyles. It is the most common paediatric elbow fracture, accounting for 50-60% of such injuries, with peak incidence at age 5-8 years. The injury typically occurs from a fall onto an outstretched hand with the elbow extended. The clinical significance lies in the proximity of the brachial artery and median nerve, particularly the anterior interosseous branch, which are at risk in displaced fractures. Treatment is guided by the Gartland classification, ranging from cast immobilization for undisplaced fractures to urgent closed reduction and percutaneous pinning for displaced injuries."

High-Yield Viva Questions

Q1: How do you classify supracondylar fractures?

A: "I use the Gartland classification, modified by Wilkins:

• Type I: Undisplaced—treated with long-arm cast
• Type II: Displaced with intact posterior cortex, subdivided into IIA (no rotation) and IIB (rotated)—Type IIA with acceptable alignment can be casted; IIB requires CRPP
• Type III: Completely displaced with no cortical contact, subdivided by displacement pattern into IIIA (posteromedial) and IIIB (posterolateral)—all require CRPP
• Type IV: Multidirectional instability with circumferential periosteal stripping—highest risk category requiring CRPP

The classification guides treatment and predicts neurovascular injury risk, which increases from less than 1% in Type I to 10-20% in Type III fractures."

Q2: What is the significance of the anterior humeral line?

A: "The anterior humeral line is a radiographic landmark on the lateral elbow view. A line drawn along the anterior cortex of the humerus should pass through the middle third of the capitellum in a normal elbow. In supracondylar fractures with extension deformity, this line passes through the anterior third or anterior to the capitellum entirely, indicating posterior displacement of the distal fragment. This finding helps confirm the diagnosis and assess the adequacy of reduction post-operatively."

Q3: How do you manage a pink pulseless hand?

A: "The pink pulseless hand—characterized by absent radial pulse but warm, pink hand with brisk capillary refill—indicates brachial artery compromise with adequate collateral flow. My management would be:

1. Urgent closed reduction and pinning within 6 hours if possible
2. Re-assess pulse after reduction
3. If pulse returns (occurs in 70-80%), observe with serial neurovascular examinations
4. If pulse remains absent but hand pink and warm, admit for observation with hourly neurovascular checks and Doppler confirmation of flow
5. Crucially, I would NOT routinely explore the artery—landmark studies by Badkoobehi and colleagues demonstrated equivalent outcomes with observation vs. exploration in the pink pulseless hand, with observation having lower complication rates
6. However, if the hand becomes cool or pale at any point, this represents progression to white pulseless status requiring immediate arterial exploration

The key distinction is that warmth and color indicate adequate perfusion via collaterals, whereas a white pulseless hand indicates limb-threatening ischaemia requiring exploration."

Q4: Describe your surgical technique for CRPP.

A: "My technique follows a systematic approach:

Reduction:

1. Longitudinal traction with elbow flexed 20-30° for 2-3 minutes to disimpact
2. Correct medial/lateral translation with thumb pressure
3. Address anterior angulation with thumb on proximal fragment and pressure on olecranon
4. Gradually flex elbow to 100-120° while maintaining reduction
5. Pronate forearm for posterolateral displacement
6. Verify reduction on AP and lateral fluoroscopy—anterior humeral line through middle capitellum, Baumann's angle 64-81°, no translation

Pinning: I prefer lateral entry divergent pins:

1. First pin from lateral condyle aimed 30-40° medially, engaging medial cortex
2. Second pin more parallel to lateral column, divergence > 30°
3. Third pin if needed for additional stability
4. All pins engage far cortex
5. Bend and cut pins outside skin

I only use a medial pin if three lateral pins cannot achieve stability, and I use mini-open technique to visualize and protect the ulnar nerve.

Post-op: Posterior splint with elbow at 90° flexion, neurovascular observations, pins removed at 3-4 weeks."

Q5: Which displacement pattern causes which nerve injury?

A: "This is determined by the direction of proximal fragment penetration:

• Posterolateral displacement (Type IIIB, most common): The proximal shaft is driven anteromedially, placing the median nerve and brachial artery at highest risk. The anterior interosseous nerve, a branch of the median, is the most commonly injured nerve overall.

• Posteromedial displacement (Type IIIA): The proximal shaft is driven anterolaterally, placing the radial nerve at risk.

• Flexion-type fractures: The ulnar nerve is at risk due to its posterior position in the cubital tunnel.

• Iatrogenic ulnar nerve injury: Occurs with medial pin placement, hence my preference for lateral pins only unless absolutely necessary."

Q6: What are the indications for arterial exploration?

A: "Arterial exploration is indicated in the following scenarios:

1. White pulseless hand that remains white and pulseless after reduction—this represents inadequate collateral circulation and limb-threatening ischaemia requiring immediate exploration

2. Deterioration from pink pulseless to white pulseless post-reduction—indicates thrombosis or progressive vascular compromise

3. Compartment syndrome developing despite adequate reduction—suggests arterial injury contributing to ischaemia

4. Open fracture with obvious arterial injury

I would NOT explore:

• Pink pulseless hand that remains pink and warm post-reduction
• Absent pulse with Doppler-confirmed arterial flow and good hand perfusion

The approach would be anterior to the brachial artery, with vascular surgery consultation for repair, which may require resection and primary anastomosis or vein graft interposition."

Common Mistakes to Avoid

❌ Stating that all pulseless hands require exploration: Modern evidence supports observation for pink pulseless hands

❌ Recommending aggressive physiotherapy: Causes inflammation and worsens stiffness; children regain motion spontaneously

❌ Not documenting pre-operative neurovascular examination: Critical for medicolegal purposes and distinguishing pre-existing from iatrogenic injury

❌ Excessive elbow flexion (> 120°) post-reduction: May compromise vascular supply

❌ Routine use of crossed pins: Increases ulnar nerve injury risk without benefit for most fracture patterns

❌ Missing compartment syndrome: Must maintain high index of suspicion, especially in floating elbow

❌ Aggressive reduction attempts in ED: Risk of neurovascular injury; reduction should be in OR with optimal conditions

Model Answer Framework

For a systematic case-based viva question:

Assessment:

• "I would take a focused history including mechanism, time since injury, and neurovascular symptoms"
• "My examination would prioritize neurovascular status—pulse, capillary refill, motor and sensory function of radial, median, and ulnar nerves"
• "I would look for the pucker sign indicating soft tissue entrapment"
• "Radiographs: AP and lateral views to classify by Gartland system"

Classification:

• "This appears to be a Gartland Type [X] fracture based on [specific features]"

Management:

• "Type I: Long-arm cast, close follow-up"
• "Type II: Decision based on rotation and alignment..."
• "Type III: Urgent CRPP within [timeframe based on neurovascular status]"
• "If pink pulseless: Urgent reduction, observation post-reduction..."
• "If white pulseless: Emergency reduction, exploration if remains ischaemic..."

Evidence:

• "This approach is supported by [AAOS guidelines/Badkoobehi study/Skaggs study]"

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13. Patient and Parent Information

What is a supracondylar fracture?

Your child has broken the bone in their upper arm just above the elbow joint. This is called a supracondylar fracture. It's the most common type of elbow fracture in children and usually happens when they fall onto an outstretched hand.

Why does it need surgery?

Not all supracondylar fractures need surgery. If the bone pieces are still in the right position (we call this "undisplaced"), a cast is enough.

However, if the bones have moved apart (which is the case for your child), we need to put them back into position and hold them there with small metal wires (pins). Without surgery, the bones would heal in the wrong position, and your child's arm would be crooked and might not work properly.

What does the surgery involve?

The operation is called "closed reduction and percutaneous pinning" (CRPP):

1. Your child will be asleep under general anaesthetic
2. The surgeon gently pulls and positions the bones back into place (reduction)
3. Small metal wires (pins) are inserted through the skin to hold the bones still (pinning)
4. X-rays are taken to make sure the bones are straight
5. A plaster cast is applied
6. The operation usually takes 30-60 minutes

The pins stick out of the skin but are covered by the cast. This sounds scary but actually makes them easier to remove later.

What are the risks?

The main risks are related to the nerves and blood vessels that run very close to the broken bone:

Nerve injury (10-15% chance):

• Most commonly affects a nerve that controls the thumb and index finger
• Your child might not be able to make an "OK" sign with these fingers
• This is usually temporary—90% recover completely within 6 months
• We always check nerve function before and after surgery

Blood vessel injury (5-10% chance):

• The artery to the hand can be kinked or damaged
• We carefully check the pulse and blood flow
• Usually improves after putting the bones back in position
• Rarely needs further surgery to fix the artery

Infection (1-3% chance):

• Around the pin sites
• Treated with antibiotics
• Pins may need to be removed early

Stiffness (5-10% chance):

• Elbow may be stiff for several months
• Children naturally regain movement—no physiotherapy needed
• By one year, most children have normal elbow movement

Crooked arm (5-10% chance):

• Despite best efforts, the arm may heal slightly crooked (cubitus varus)
• This is usually just cosmetic—doesn't affect function
• Can be corrected with another operation if desired (rarely necessary)

What happens after surgery?

In hospital:

• Your child will stay in hospital for 1-2 days
• We monitor the circulation and nerve function carefully
• Pain is controlled with regular medication
• The arm must be kept elevated

At home:

• Keep the arm elevated on pillows
• Move the fingers regularly
• Give pain medication as prescribed
• Watch for warning signs (see below)
• Come to clinic in one week for a check-up

Pin and cast removal (3-4 weeks later):

• Done in clinic—no anaesthetic needed
• Removing the pins feels like a quick tug—briefly uncomfortable but not very painful
• Cast is removed at the same time
• Your child can start using the arm again

When can my child return to activities?

• School: 1-2 weeks (no sports)
• Light activities: 4-6 weeks
• Contact sports: 3 months after pin removal

Warning signs—come back to hospital immediately if:

• Fingers become pale, blue, or very cold
• Your child cannot feel or move their fingers
• Severe pain that doesn't improve with pain medication
• Pain when you gently straighten your child's fingers
• Cast becomes too tight
• Fever, bad smell, or pus from the cast

Will my child's arm be normal?

Most children (over 95%) make a complete recovery and return to all their previous activities. The elbow may be slightly stiff for 6-12 months, but children naturally regain their movement. The scars from the pins are tiny and fade over time.

A small percentage of children have a slightly crooked arm (cubitus varus), which is usually just cosmetic and doesn't affect how the arm works.

Nerve injuries, if they occur, usually recover fully within 6 months.

Questions to ask the doctor:

• How displaced is the fracture?
• What is the chance my child will need surgery?
• When will the surgery happen?
• How long will the pins need to stay in?
• When can my child go back to school/sports?

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Document Metadata:

• Lines: 1,062
• Words: ~12,500
• Citations: 18
• Last Updated: 2026-01-06
• Target Examination: MRCS, FRCS (Trauma & Orthopaedics), FRACS (Orthopaedic Surgery)
• Specialty Focus: Paediatric Orthopaedics, Trauma Surgery

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