Supracondylar Fracture (Child)

1. Clinical Overview

Summary

Supracondylar fractures of the humerus are the most common elbow fracture in children, accounting for 50-60% of all paediatric elbow injuries. They typically occur in children aged 5-7 years following a Fall On Outstretched Hand (FOOSH) with the elbow in extension. The Extension Type (95% of cases) results in posterior displacement of the distal fragment. [1,2,3]

The fracture is notoriously dangerous due to the intimate proximity of the Brachial Artery and Median Nerve (specifically the Anterior Interosseous Nerve branch) to the fracture site. The Gartland Classification guides management: Undisplaced fractures (Type I) are immobilized in a cast; Displaced fractures (Type II/III) require Closed Reduction and Percutaneous Pinning (CRPP). [4,5]

Key Facts

• The "Fat Pad Sign": In a non-displaced fracture (Type I), the fracture line may be invisible on initial radiographs. The only radiographic sign may be elevation of the anterior or posterior fat pad (Sail Sign) due to haemarthrosis. The posterior fat pad is always pathological. [6]
• Neurological Injury: Reported incidence ranges from 10-20% of displaced fractures. Anterior Interosseous Nerve (AIN) palsy is the most common neurological complication, presenting with inability to flex the interphalangeal joint of the thumb and distal interphalangeal joint of the index finger. Radial Nerve injury is the second most common. [7,8]
• Vascular Injury: Approximately 1-2% of cases present with a pulseless hand. The "Pink Pulseless" hand (warm, well-perfused despite absent radial pulse) requires urgent closed reduction. The "White Pulseless" hand (cold, poorly perfused) represents a vascular emergency requiring immediate reduction and potential vascular surgical consultation. [9,10]

Clinical Pearls

"Puckered Skin is a Warning": The presence of skin dimpling or puckering anteriorly at the elbow indicates that the proximal bone spike has buttonholed through the Brachialis muscle and potentially the antecubital fascia. This is a "complex" reduction scenario. Forceful manipulation without careful soft tissue handling can cause further neurovascular injury. The soft tissue must be carefully "milked" off the bone spike during reduction. [11]

"The OK Sign": Always assess the Anterior Interosseous Nerve by asking the child to make an "OK" sign (touching the tip of the thumb to the tip of the index finger). If they make a pincer (flat) pinch using the pulps of the digits instead of forming a round "O", the AIN is injured. This tests FPL (Flexor Pollicis Longus) and FDP to index (Flexor Digitorum Profundus). [7,12]

"Gunstock Deformity": Malunion leads to Cubitus Varus, a medial angulation of the distal humerus creating a cosmetically unacceptable "gunstock" appearance. It is primarily a cosmetic deformity with minimal functional impairment, but parents and older children often find it distressing. Corrective osteotomy is considered for severe cases. [13,14]

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2. Epidemiology

Demographics

• Incidence: Supracondylar fractures represent 50-60% of all paediatric elbow fractures and are the most common paediatric fracture requiring operative intervention. [1,2]
• Age: Peak incidence occurs between 5-7 years of age, coinciding with maximum physical activity and incomplete ossification of the distal humerus. The pediatric elbow is vulnerable because ligaments are stronger than the incompletely ossified bone. [3,15]
• Gender: Slight male predominance (Male:Female ratio approximately 1.5-2:1). [3]
• Side: The non-dominant arm (typically left) is more commonly affected. [3]
• Seasonality: Higher incidence during spring and summer months, correlating with increased outdoor play activity and use of playground equipment. [15]

Risk Factors

• Developmental Anatomy: The supracondylar region of the humerus is the thinnest and weakest portion of the bone in children (hourglass shape), making it particularly vulnerable to fracture.
• Mechanism of Injury: Falls from playground equipment (monkey bars, swings, climbing frames) are the most common mechanism. Sports-related injuries and falls from bicycles are also frequent causes.
• Ligamentous Laxity: Children with generalized joint hypermobility may experience hyperextension forces more readily.

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3. Pathophysiology

Anatomy of the Supracondylar Region

The supracondylar region of the distal humerus is a transition zone between the diaphyseal cortical bone and the metaphyseal trabecular bone. This area is anatomically thin, creating a natural stress concentration point. [16]

Key Neurovascular Structures at Risk:

• Brachial Artery: Courses immediately anterior to the distal humerus. In extension-type fractures, the proximal fragment displaces anteriorly, creating a spike that can lacerate, contuse, or thrombose the brachial artery. Alternatively, traction injury can cause arterial spasm or intimal tear. [9,10]
• Median Nerve and AIN: The median nerve and its motor branch (Anterior Interosseous Nerve) lie directly anterior to the fracture site. The sharp proximal fragment can directly injure these structures. AIN palsy is typically neuropraxia (stretch injury) and resolves spontaneously over 3-6 months. [7,12]
• Radial Nerve: Courses laterally and can be injured in extension-type fractures, particularly with lateral displacement or during reduction maneuvers. [8]
• Ulnar Nerve: At risk in flexion-type fractures and during medial pinning (iatrogenic injury). [17]

Fracture Types by Mechanism

Extension Type (95%)

• Mechanism: Fall on outstretched hand (FOOSH) with elbow in extension.
• Displacement Pattern: The distal fragment is displaced posteriorly and superiorly. The proximal fragment's anterior spike threatens the brachial artery and median nerve.
• Associated Injuries: Brachial artery injury, median/AIN nerve palsy, radial nerve injury.

Flexion Type (5%)

• Mechanism: Direct blow to the posterior aspect of a flexed elbow (e.g., fall onto flexed elbow).
• Displacement Pattern: The distal fragment is displaced anteriorly. Rare but potentially more dangerous.
• Associated Injuries: Ulnar nerve injury, olecranon fracture.

Gartland Classification (Extension Type)

The Gartland Classification is the most widely used system for grading extension-type supracondylar fractures and guides treatment decisions: [4]

• Type I: Undisplaced or minimally displaced fracture with intact anterior and posterior cortices.

  • Fracture line may be barely visible or invisible.
  • Anterior Humeral Line passes through the capitellum (or just anterior to middle third).
  • Sail sign (fat pad elevation) may be the only radiographic finding.

• Type II: Angulated fracture with intact posterior cortex serving as a hinge.

  • Anterior Humeral Line does not pass through the capitellum.
  • Posterior cortex remains intact (key distinguishing feature from Type III).
  • Subdivided into:
    • Type IIA: No rotational deformity.
    • Type IIB: Rotational deformity present (higher instability).

• Type III: Completely displaced fracture with loss of cortical contact.

  • Both anterior and posterior cortices disrupted.
  • Complete instability with no bony hinge.
  • High risk of neurovascular injury.

• Type IV (Leitch Modification): Instability in both flexion AND extension (multidirectional instability). Extremely unstable. [18]

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4. Clinical Presentation

Symptoms

• Pain: Severe pain at the elbow, exacerbated by any attempted movement.
• Refusal to Move Arm: Child holds the affected arm protectively at the side, often supporting it with the opposite hand.
• Swelling: Rapid onset of significant soft tissue swelling around the elbow.
• Deformity: May report visible deformity or abnormal positioning of the forearm.

Signs

Inspection

• S-Deformity: In Type III fractures, the elbow may demonstrate an "S-shaped" deformity when viewed from the lateral aspect, with prominence of the olecranon posteriorly.
• Swelling and Ecchymosis: Marked swelling around the elbow joint. Ecchymosis may not be immediately apparent but develops over 12-24 hours.
• Pucker Sign: Critical finding - Dimpling or puckering of the skin anteriorly at the elbow indicates that the proximal bone spike has penetrated through Brachialis and is tenting the skin from beneath. This signifies soft tissue interposition and predicts difficult reduction. [11]

Palpation

• Tenderness: Exquisite tenderness over the supracondylar region.
• Crepitus: May be palpable with gentle examination (avoid excessive manipulation).

Neurovascular Examination (MANDATORY)

Vascular Assessment:

• Radial Pulse: Palpate and document presence, quality, and symmetry compared to contralateral limb.
• Capillary Refill: Normal is less than 2 seconds. Prolonged capillary refill indicates compromised perfusion.
• Hand Color and Temperature: Assess whether the hand is pink and warm ("Pink Pulseless") or pale/white and cool ("White Pulseless").
• Handheld Doppler: If pulses not palpable, use Doppler to assess arterial flow.

Neurological Assessment (Test all three major nerves):

• Median Nerve / Anterior Interosseous Nerve (AIN):

  • OK Sign Test: Ask child to make "OK" sign (tip-to-tip pinch of thumb and index finger). AIN injury results in flat pulp-to-pulp pinch because FPL and FDP (index) cannot flex the IP joints. [7,12]
  • Median sensory: Test sensation to lateral 3.5 digits (often difficult in young, distressed children).

• Radial Nerve:

  • Thumbs Up Test: Ask child to extend the thumb (EPL - Extensor Pollicis Longus). Inability indicates radial nerve injury.
  • Alternatively, assess wrist and finger extension (wrist drop in complete injury).
  • Radial sensory: Test first web space sensation.

• Ulnar Nerve:

  • Cross Fingers Test: Ask child to cross index and middle fingers (requires intact intrinsic function). Alternatively, test finger abduction/adduction.
  • Ulnar sensory: Test medial 1.5 digits.

Compartment Syndrome Assessment

• Pain on Passive Finger Extension: THE cardinal sign. Passive extension of the fingers stretches the flexor compartment. If this causes severe pain out of proportion to passive movement, compartment syndrome must be suspected. [19,20]
• Tense Forearm: Palpate the flexor compartment - a tense, swollen, tender forearm is concerning.
• Progressive Pain: Pain that is worsening despite immobilization and analgesia.
• Paraesthesia and Pallor: Late signs - do NOT wait for these.

Documentation: Record detailed neurovascular examination findings in the medical record before and after any manipulation, reduction, or surgical intervention.

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5. Investigations

X-Ray Elbow (AP and Lateral) - MANDATORY

Lateral View - Most Important Projection

• Anterior Humeral Line (AHL):

  • Draw a line along the anterior cortex of the humeral shaft extending distally.
  • In a normal elbow, this line should pass through the middle third of the capitellum ossific nucleus.
  • In a supracondylar fracture (Type II or III), the AHL passes anterior to the capitellum or does not intersect it at all. [6,21]
  • This is a sensitive indicator of loss of extension even in subtle Type I fractures.

• Fat Pad Sign:

  • Posterior Fat Pad: Any elevation of the posterior fat pad is always pathological and indicates intra-articular effusion (haemarthrosis). In the absence of a visible fracture line, this mandates treatment as an occult fracture. [6]
  • Anterior Fat Pad: Normally sits in the coronoid fossa. Elevation creates the "Sail Sign"

• also indicates effusion but less specific than posterior fat pad.

• Fracture Pattern: Assess displacement, angulation, and comminution.

AP View

• Baumann's Angle:

  • Angle between a line along the long axis of the humerus and a line along the lateral condylar physis (or capitellar epiphysis).
  • Normal range: 64-81° (average 72°).
  • Used to assess varus/valgus alignment and rotational deformity.
  • Post-reduction Baumann's angle should be within 5° of the contralateral side to minimize risk of cubitus varus. [21,22]

• Medial/Lateral Displacement: Document direction and degree of displacement.

Quality of Radiographs

• True Lateral: Essential for accurate assessment. The lateral radiograph should show the anterior and posterior cortices of the distal humerus as a single line. Overlapping shadows of the condyles indicate proper positioning.
• Comparison Views: Consider radiographs of the contralateral (uninjured) elbow in cases where anatomy is unclear due to incomplete ossification.

Additional Imaging (Selected Cases)

• CT Scan: Rarely indicated. May be useful for:

  • Preoperative planning in complex fracture patterns.
  • Assessment of intra-articular extension.

• MRI: Not routinely used. May have a role in assessing soft tissue injuries, vascular integrity, or nerve continuity in delayed presentations or complications.

• Angiography: Reserved for cases of persistent vascular compromise after reduction where surgical exploration is being considered. Non-invasive CT angiography may be used if available.

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6. Management Algorithm

               ELBOW INJURY (CHILD - PAINFUL, SWOLLEN)
                            ↓
                   IMMEDIATE NEUROVASCULAR EXAM
                   (Pulse, Perfusion, Nerve Function)
                            ↓
              ┌─────────────┴──────────────┐
         PULSELESS                   PULSE PRESENT
              ↓                            ↓
   ┌──────────┴─────────┐           PLAIN RADIOGRAPHS
   │                    │           (AP + Lateral)
WHITE HAND          PINK HAND              ↓
(Cold, Pale)        (Warm, Pink)      GARTLAND CLASSIFICATION
   │                    │                  ↓
   ↓                    ↓         ┌────────┼────────┐
VASCULAR         URGENT REDUCTION  │        │        │
EMERGENCY        + CRPP            │        │        │
   │             (within 6h)    TYPE I   TYPE II  TYPE III
   ↓                  │            │        │        │
IMMEDIATE            ↓            ↓        ↓        ↓
REDUCTION        Post-reduction: Above   CRPP      CRPP
in ED/OR         Reassess pulse  Elbow   (Urgent)  (Urgent)
   │                  │          Cast              
   ↓                  ↓          3 weeks            
If pulse returns: Observe        │                  
If remains white: Vascular       ↓                  
exploration +/- repair      F/U X-ray 1 week       
                            (check no slip)         

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7. Management Protocols

Emergency Department Initial Management (ALL Types)

1. Analgesia: Adequate pain relief (intranasal fentanyl, IV morphine, nerve blocks).
2. Immobilization: Temporary splinting in position of comfort (typically 20-30° flexion). Avoid hyperflexion - this can compromise vascular flow.
3. Neurovascular Documentation: Detailed assessment and documentation before any intervention.
4. Radiographs: AP and lateral X-rays of the elbow.
5. NPO (Nil By Mouth): Most displaced fractures will require operative management - keep fasted.

Type I (Undisplaced)

Radiographic Criteria:

• Fracture line visible (or fat pad sign only).
• No displacement or less than 2mm displacement.
• Intact anterior and posterior cortices.
• Anterior Humeral Line passes through middle third of capitellum (or just anterior).

Treatment:

• Above Elbow Backslab or Cast: Apply with elbow at 90° flexion and forearm in neutral rotation.
• Neurovascular Check: Reassess after splint application.
• Duration: 3 weeks immobilization.
• Follow-up: X-ray at 7-10 days to ensure no displacement (late slip can occur as swelling subsides). Repeat X-ray at 3 weeks prior to cast removal.

Pitfall: Truly "undisplaced" fractures are rare. A fat pad sign with no visible fracture line should be treated as an occult fracture.

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Type II (Displaced with Intact Posterior Cortex)

Radiographic Criteria:

• Fracture displaced and angulated.
• Posterior cortex intact (serves as a hinge).
• Anterior Humeral Line does not pass through capitellum.
• Subdivided:
  • Type IIA: No rotational deformity - may be amenable to closed reduction and casting in select cases.
  • Type IIB: Rotational deformity present - high risk of redisplacement, requires pinning.

Treatment:

• Current Standard: Closed Reduction and Percutaneous Pinning (CRPP).
• Rationale: Historical management with casting alone resulted in high rates of loss of reduction (up to 30-40%) leading to cubitus varus deformity. Pinning provides stability and allows earlier mobilization. [5,23]
• Timing: Urgent (within 12-24 hours), but not necessarily immediate unless neurovascular compromise.
• Technique:
  • Closed reduction under general anaesthesia.
  • Fluoroscopic confirmation of anatomical reduction.
  • Percutaneous K-wire fixation (see pinning technique below).
  • Above elbow backslab application.

Pinning Technique:

• Lateral Entry Wires: Preferred technique to avoid iatrogenic ulnar nerve injury.
  • 2 or 3 divergent lateral K-wires provide adequate stability.
  • Wires should diverge at least 30-40° for maximum stability.
• Crossed Pins (Medial + Lateral): Biomechanically strongest configuration, but carries risk of iatrogenic ulnar nerve injury (up to 3-4%) from medial pin. Reserved for unstable fractures where lateral pins alone are insufficient. [24]
• Mini-incision for Medial Pin: If medial pin required, use mini-open technique to protect ulnar nerve.

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Type III (Completely Displaced)

Radiographic Criteria:

• Complete loss of bony contact.
• Anterior and posterior cortices disrupted.
• Marked displacement and rotation.

Treatment:

• Closed Reduction and Percutaneous Pinning (CRPP).
• Timing:
  • Urgent (as soon as feasible on emergency operating list, ideally within 12-24 hours).
  • Immediate (middle-of-the-night surgery) if:
    • Vascular compromise (white pulseless hand).
    • Open fracture.
    • Impending compartment syndrome.
• Evidence: The BOAST 11 Guidelines (British Orthopaedic Association) state that for neurovascularly intact fractures, surgery can be performed the next day during daylight hours by an experienced team. There is no benefit to operating at 3am with a fatigued team unless there is vascular compromise. [25]

Reduction Technique:

1. Traction: Apply longitudinal traction to disimpact the fracture and restore length.
2. Correction of Medial/Lateral Displacement: Apply corrective pressure to realign in the coronal plane.
3. Correction of Posterior Displacement:
   • Apply anterior pressure to the olecranon while applying posterior pressure to the distal fragment.
   • Milk the Soft Tissue: If skin puckering present, gently "milk" the Brachialis muscle off the anterior spike before attempting full reduction.
4. Elbow Flexion: Once reduced, gently flex the elbow to 90-120° (maintain reduction while avoiding vascular compromise from hyperflexion).
5. Pronation of Forearm: Pronation helps lock the reduction and tightens the medial periosteal hinge.
6. Fluoroscopic Confirmation: AP and lateral views confirm anatomical reduction, restoration of Anterior Humeral Line, and appropriate Baumann angle.

Pinning (as per Type II).

Post-Operative Care:

• Above elbow backslab with elbow at 90°.
• Neurovascular reassessment in recovery.
• K-wires left buried under skin or left protruding with sterile pin site dressing.
• Pins removed at 3-4 weeks (outpatient clinic - simple procedure, no anaesthesia required).

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The "Pink Pulseless Hand"

A "Pink Pulseless" hand is defined as absent radial pulse with a warm, well-perfused hand (normal capillary refill, normal color). This indicates that collateral circulation is maintaining adequate perfusion despite brachial artery compromise. [9,10]

Pathophysiology:

• Brachial artery spasm, contusion, or compression (not complete transection).
• Collateral vessels (recurrent radial, recurrent ulnar, interosseous) provide adequate flow.

Management:

• Urgent Closed Reduction and Pinning: Reduction relieves pressure/traction on the artery.
• Post-Reduction Assessment:
  • Pulse Returns: Excellent outcome - discharge as per standard protocol.
  • Hand Remains Pink but Pulseless: Acceptable - collateral flow adequate. Admit overnight for observation. Serial neurovascular checks. Most resolve spontaneously.
  • Hand Turns White/Cold: Vascular emergency - proceed to exploration (see below).

Systematic Review Evidence: A 2019 systematic review by Delniotis et al. comparing "watchful expectancy" versus surgical exploration of the brachial artery in pink pulseless hands found that the vast majority (> 90%) of pink pulseless hands remain well-perfused without intervention. Routine exploration is not indicated. [10]

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The "White Pulseless Hand"

A "White Pulseless" hand is defined as absent radial pulse with a pale, cool hand (prolonged capillary refill, poor perfusion). This represents a vascular emergency. [9,19]

Pathophysiology:

• Brachial artery laceration, thrombosis, or complete occlusion.
• Inadequate collateral flow.

Management:

• Immediate Closed Reduction (in ED or OR - do not delay).
• Post-Reduction Assessment:
  • Pulse Returns and Hand Pinks Up: Reduction relieved vascular compromise. Proceed to pinning and close observation.
  • Hand Remains White: Urgent Vascular Surgery Consultation.
    • Proceed to Brachial Artery Exploration.
    • Identify site of injury.
    • Repair or bypass as indicated (interposition vein graft if required).

Time is Muscle: Irreversible ischaemic damage (Volkmann's contracture) begins after 4-6 hours of complete ischaemia. Immediate reduction and prompt vascular surgery if needed are essential. [19,20]

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Open Fractures

Rare but Important:

• Open supracondylar fractures are uncommon (less than 1% of cases).
• Usually result from high-energy trauma or bone spike penetrating skin from within.

Management:

• Immediate Antibiotics: Cephalosporin (e.g., cefazolin). Add gentamicin if gross contamination.
• Tetanus Prophylaxis: Update as needed.
• Wound Photograph and Sterile Dressing: Do not repeatedly expose wound.
• Urgent Surgical Debridement and Irrigation: Within 6 hours.
• Reduction and Stabilization: CRPP if possible. Consider external fixation if extensive soft tissue injury.

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8. Complications

Immediate Complications

Neurovascular Injury

Nerve Injury (10-20% of displaced fractures): [7,8]

• Anterior Interosseous Nerve (AIN): Most common (40-50% of nerve injuries). Usually neuropraxia from stretch. Typically recovers spontaneously within 3-6 months. Manage expectantly unless nerve transection suspected.
• Radial Nerve: Second most common (30% of nerve injuries). Recovery similar to AIN.
• Median Nerve: Can be injured in addition to AIN (sensory symptoms in lateral palm/digits).
• Ulnar Nerve: More common in flexion-type fractures or iatrogenic injury during medial pin insertion (3-4% risk with crossed pins).

Management of Nerve Palsy:

• Document pre-operative and post-operative function.
• If nerve palsy present pre-operatively: Observe. Neuropraxia expected to recover.
• If nerve palsy develops post-operatively (especially ulnar after medial pinning): Consider nerve exploration if pin is in contact with nerve on imaging. Remove offending pin.
• EMG/NCS: Consider at 6 weeks if no clinical recovery to confirm neuropraxia vs. axonotmesis vs. neurotmesis.
• Tendon Transfers: Only if no recovery after 12-18 months (rare).

Vascular Injury (1-2%): Discussed above (Pink/White Pulseless Hand). [9,10]

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Compartment Syndrome / Volkmann's Ischaemic Contracture

Incidence: 0.1-0.3% of supracondylar fractures, but most feared complication. [19,20]

Pathophysiology:

• Bleeding and oedema within the flexor compartment of the forearm increase intracompartmental pressure.
• When pressure exceeds capillary perfusion pressure, muscle and nerve ischaemia ensue.
• Irreversible muscle necrosis begins after 4-6 hours.
• Result: Fibrosis and contracture of the flexor muscle mass (Volkmann's Ischaemic Contracture).

Clinical Presentation:

• Pain: Severe, progressive, out of proportion to injury.
• Pain on Passive Finger Extension: Pathognomonic. Passive stretching of ischaemic flexor muscles causes excruciating pain.
• Tense Forearm: Palpably swollen, tender flexor compartment.
• Paraesthesia: Numbness in median nerve distribution (late sign).
• Pallor, Pulselessness, Paralysis: Late signs - do NOT wait for these.

Management:

• High Index of Suspicion: Monitor all displaced supracondylar fractures closely post-reduction.
• Remove Constricting Bandages/Casts: Immediately split cast to skin if compartment syndrome suspected.
• Reassess: If symptoms persist after cast removal, compartment syndrome confirmed.
• Emergency Fasciotomy: Decompress all compartments of the forearm (volar and dorsal). Time-critical - do not delay for compartment pressure measurements in a clinical diagnosis.
• Post-Fasciotomy: Leave wounds open, delayed primary closure or skin grafting at 48-72 hours.

Volkmann's Ischaemic Contracture (Sequela of Untreated Compartment Syndrome):

• Deformity: Flexed wrist, hyperextended MCPJs, flexed IPJs (claw hand).
• Muscle Fibrosis: Flexor compartment muscles replaced by scar tissue.
• Nerve Damage: Median and ulnar nerve injury (sensory loss, intrinsic muscle paralysis).
• Treatment: Reconstructive surgery (muscle slide procedures, tendon lengthening, nerve decompression). Outcomes are poor - prevention is key. [20]

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Early Complications (Weeks)

Loss of Reduction

• Incidence: Higher with cast immobilization alone (30-40% for Type II fractures). Significantly reduced with K-wire fixation (less than 5%). [5,23]
• Cause: Inadequate reduction, unstable fracture pattern, inadequate fixation, premature pin removal.
• Detection: Follow-up X-ray at 1 week (mandatory for Type I fractures in cast, reassuring for pinned fractures).
• Management: If detected early (within 7-10 days), re-manipulation and pinning may be considered. After 2 weeks, malunion likely; may require corrective osteotomy later.

Pin Site Infection

• Incidence: 2-5% with percutaneous pins.
• Presentation: Erythema, purulent discharge, pain at pin site.
• Management:
  • Superficial: Oral antibiotics (e.g., flucloxacillin), pin site care.
  • Deep/Severe: IV antibiotics, early pin removal (if fracture sufficiently healed), surgical debridement if osteomyelitis.
• Prevention: Bury pins under skin vs. leave percutaneous (controversial - both acceptable).

Stiffness

• Minor Loss of Terminal Extension: Common (10-15%). Usually resolves with time and gentle physiotherapy.
• Significant Stiffness: Rare if appropriate immobilization duration (3-4 weeks) and early mobilization post-pin removal.
• Myositis Ossificans: Rare. Avoid aggressive passive stretching.

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Late Complications (Months-Years)

Cubitus Varus (Gunstock Deformity)

Incidence: Most common late complication. Reported in 5-30% of cases depending on quality of reduction and fixation. [13,14]

Pathophysiology:

• Malunion with medial angulation (varus) of the distal fragment.
• Causes:
  • Inadequate reduction (failure to correct rotation or medial collapse).
  • Loss of reduction (slipped cast, inadequate fixation).
  • Avascular necrosis of the lateral condyle (rare).
  • Lateral collapse due to comminution.

Clinical Features:

• Cosmetic Deformity: "Gunstock" appearance of the arm (elbow deviates medially when extended).
• Functional Impact: Minimal. Range of motion and strength usually normal.
• Psychological Impact: Distressing to parents and older children/adolescents.
• Late Complications: Tardy posterolateral rotatory instability, osteoarthritis (rare, controversial).

Prevention:

• Anatomical reduction with restoration of Baumann angle (within 5° of contralateral side).
• Adequate K-wire fixation to prevent loss of reduction.
• Post-reduction radiographic confirmation (AP and lateral).

Management:

• Observation: If mild (less than 10° varus) and patient unconcerned, observe.
• Corrective Osteotomy: For moderate-severe deformity (> 15° varus) or patient/parent request.
  • Timing: Ideally after skeletal maturity (no remodeling potential for varus in distal humerus).
  • Techniques: Lateral closing wedge osteotomy, dome osteotomy, step-cut osteotomy.
  • Outcomes: Good cosmetic correction, but small risk of iatrogenic nerve injury or stiffness.

Cubitus Valgus

• Much less common than varus.
• Can result from lateral condyle physeal arrest or avascular necrosis.
• May predispose to tardy ulnar nerve palsy (ulnar nerve traction injury at elbow).

Avascular Necrosis (AVN)

• Rare (less than 1%).
• Most commonly affects the lateral condyle (trochlea or capitellum).
• Presentation: Progressive deformity, loss of motion, pain.
• Radiographic: Sclerosis, collapse of articular surface.
• Management: Observation, activity modification. Rarely requires surgical intervention.

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9. Evidence & Guidelines

BOAST 11 Guidelines (British Orthopaedic Association)

Key Recommendations: [25]

• Timing of Surgery:
  • Neurovascularly intact fractures can be managed on the next available elective trauma list (within 12-24 hours) during daylight hours.
  • There is no evidence that operating in the middle of the night improves outcomes. Operating with a rested, experienced team in optimal conditions is preferable.
  • Exceptions: Vascular compromise (white pulseless hand), open fractures, or impending compartment syndrome require immediate intervention.
• Pinning Configuration: Lateral entry pins are preferred to minimize risk of iatrogenic ulnar nerve injury. Crossed pins (medial + lateral) should be reserved for fractures where lateral pins alone provide inadequate stability.
• Post-Operative Immobilization: Above elbow backslab or cast for 3-4 weeks.
• Pin Removal: 3-4 weeks post-operatively (outpatient clinic setting).

Wilkins Modification of Gartland Classification

• Subdivides Type II into:
  • Type IIA: Angulated with intact posterior cortex, no rotation.
  • Type IIB: Angulated with intact posterior cortex, rotational deformity present.
• Clinical Significance: Type IIB fractures are more unstable and more likely to lose reduction if treated with casting alone. Pinning is strongly recommended for IIB. [18]

Leitch Type IV Classification

• Added Type IV: Fractures with complete periosteal disruption demonstrating instability in both flexion and extension (multidirectional instability).
• These represent the most unstable fractures and require meticulous reduction and robust fixation. [18]

Systematic Review: Pink Pulseless Hand Management

Delniotis et al., 2019: [10]

• Compared "watchful expectancy" (observation after reduction) vs. immediate surgical exploration of the brachial artery in pink pulseless hands.
• Findings:
  • Over 90% of pink pulseless hands remain well-perfused without arterial exploration.
  • Complication rates (Volkmann's contracture, long-term ischaemia) were not significantly different between groups.
  • Routine exploration subjects patients to unnecessary surgery and risk of arterial injury.
• Conclusion: Watchful expectancy with close neurovascular monitoring is the recommended approach for pink pulseless hands. Explore only if hand becomes white/cold or perfusion deteriorates.

Biomechanical Studies: Pin Configuration

Chen et al., 2015: Systematic review of biomechanical studies on pin configurations. [24]

• Crossed Pins (1 medial + 1 lateral): Biomechanically strongest configuration (highest resistance to rotation and displacement).
• Two Lateral Divergent Pins: Adequate stability for most fractures. Increasing divergence angle (> 30°) improves stability.
• Three Lateral Pins: Stability approaches that of crossed pins without ulnar nerve risk.
• Clinical Recommendation: Use lateral pins as first-line. Add medial pin only if lateral pins provide inadequate stability. Use mini-incision to protect ulnar nerve if medial pin required.

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10. Prognosis

Overall Outcomes

With appropriate management, the prognosis for pediatric supracondylar fractures is excellent: [2,5]

• Union Rate: > 95%. Non-union is extremely rare.
• Return to Full Function: > 90% achieve full range of motion and normal strength by 6-12 months.
• Complications: Low rates of significant complications with modern management protocols (CRPP for displaced fractures).

Factors Affecting Prognosis

Good Prognosis:

• Type I fractures (undisplaced).
• Anatomical reduction (restoration of Anterior Humeral Line, Baumann angle within 5° of contralateral).
• Stable fixation (appropriate pin configuration).
• Absence of neurovascular injury.

Guarded Prognosis:

• Type III fractures with significant displacement.
• Open fractures.
• Vascular injury requiring exploration.
• Compartment syndrome (even with prompt fasciotomy).
• Significant soft tissue injury (pucker sign).

Long-Term Outcomes

• Nerve Injury: 90-95% of neuropraxias recover completely within 3-6 months. Persistent deficit is rare. [7,8]
• Vascular Injury: If pulse returns after reduction, long-term outcomes are excellent. Persistent pink pulseless hands generally remain asymptomatic. [10]
• Cubitus Varus: Does not remodel. If present, persists lifelong unless corrected surgically. Functional impact is minimal. [13,14]
• Stiffness: Minor loss of terminal extension (5-10°) is common but rarely functionally significant. Children have excellent remodeling potential.

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11. Patient and Family Explanation

What is broken?

Your child has broken the bone just above the elbow joint. This bone is called the humerus, and the break is in an area called the supracondylar region (just above the elbow). This is the most common type of elbow fracture in children and usually happens when they fall on an outstretched hand, often from playground equipment like monkey bars or climbing frames.

Why is this fracture serious?

The area where the bone is broken is very close to important structures:

• Nerves: The nerves that control movement and feeling in the hand and fingers run right next to the fracture. Sometimes the nerves can be stretched or bruised by the fracture.
• Blood vessels: The main artery that supplies blood to the forearm and hand runs directly in front of the fracture site. In some cases, the artery can be compressed or injured.

This is why we carefully check your child's pulse, sensation, and ability to move their fingers before and after treatment.

Does it need an operation?

It depends on how displaced (moved apart) the fracture is:

• Minimally Displaced (Type I): If the bone is still in good position, we can treat it with a cast for about 3 weeks. We will need to take another X-ray in about a week to make sure the bone hasn't slipped.

• Displaced (Type II or III): If the bone ends have moved significantly out of position, a cast alone is not enough. The bones need to be put back in the correct position (reduction) and held there with small metal wires (pins). This requires:

  • General anaesthesia (your child will be asleep).
  • Closed reduction: The surgeon gently manipulates the bone back into position without making a large cut.
  • Percutaneous pinning: 2-3 thin metal wires (like thick needles) are inserted through the skin and into the bone to hold it in the correct position. This is done using X-ray guidance.
  • Cast: An above-elbow cast is applied after the wires are in place.

What are the wires/pins?

The pins are smooth metal wires (K-wires) about 2mm thick. They go through the skin and into the bone to hold it steady while it heals. They are either:

• Buried under the skin, or
• Left sticking out slightly with a clean dressing over them.

They stay in for 3-4 weeks while the bone becomes "sticky" (early healing). Once the bone has healed enough, the pins are removed in the clinic. Pin removal is usually quick and feels like a brief pinch - most children do not need anaesthesia for this.

When will the operation happen?

If your child's circulation and nerve function are normal, the operation is urgent but not an emergency. It will typically be done within the next 12-24 hours on the emergency operating list. Operating during the day with a well-rested surgical team gives the best results.

However, if there is concern about the blood supply to the hand (e.g., the hand is very pale or cold), the operation will be done immediately as an emergency.

What are the risks?

Common:

• Stiffness: Some children lose a few degrees of elbow straightening. This usually improves over time with gentle use and rarely causes problems.
• Pins: Small risk of infection at the pin sites (2-5%). This is usually minor and treated with antibiotics.

Uncommon but Important:

• Nerve injury: 10-20% of children with displaced fractures have a temporary nerve injury (often present before surgery due to the fracture itself). This usually recovers fully within 3-6 months. Permanent nerve damage is very rare.
• Crooked elbow (Cubitus Varus): If the bone doesn't heal in perfect alignment, the elbow may look slightly bent inwards (gunstock deformity). This is mostly a cosmetic issue and doesn't usually affect function. It can be corrected with surgery if desired when your child is older.

Rare:

• Compartment syndrome: Severe swelling in the forearm can compress the muscles. This is a surgical emergency. We monitor for this closely and if it occurs, urgent surgery (fasciotomy) is needed to release the pressure.
• Blood vessel injury: Rarely, the artery can be damaged and may require repair by a vascular surgeon.

Will the arm be straight?

Our goal is to get the bone back into perfect alignment so the arm heals straight. We use X-rays during surgery to check the position carefully. Most children heal with a straight arm and full function.

However, even with perfect surgery, sometimes the bone heals with a slight bend (cubitus varus). This is more common if the fracture was very displaced. The risk is reduced by using the metal pins to hold the bone in the correct position while it heals.

What happens after surgery?

• Pain relief: We will give your child pain medicine (paracetamol, ibuprofen, sometimes stronger medicine for the first few days).
• Cast: Your child will wear an above-elbow cast for 3-4 weeks. It's important to keep the cast dry.
• Pin removal: At 3-4 weeks, we remove the pins in the clinic. This is quick and usually doesn't require anaesthesia or sedation.
• Rehabilitation: After the cast and pins are removed, we encourage gentle use of the elbow. Most children naturally regain movement through play. Formal physiotherapy is usually not needed.
• Return to activities: Most children can return to normal activities (including sports) by 6-8 weeks after the fracture.

How long until full recovery?

• Bone healing: 3-4 weeks for initial healing (enough to remove pins).
• Full strength and movement: 3-6 months. Children have excellent healing and remodeling capacity.
• Return to sports/climbing: Usually 6-8 weeks after injury.

Follow-up appointments

• Week 1: X-ray (if treated in cast) or post-operative wound check.
• Week 3-4: Pin removal and cast removal.
• Week 6: Final X-ray to ensure healing. Clinic review to check movement.

Questions to ask us

• Is my child's nerve and blood supply to the hand normal?
• What type of fracture is it (Type I, II, or III)?
• Will pins be needed?
• When will the operation happen?
• What pain relief can we give at home?
• When can they return to school/sports?

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12. Examination Focus (Viva Vault)

Question 1: Describe the Anterior Humeral Line and its clinical significance.

Answer: The Anterior Humeral Line (AHL) is a radiographic assessment tool used on the true lateral X-ray of the elbow.

Method: Draw a line along the anterior cortex of the humeral shaft and extend it distally across the elbow joint.

Normal Anatomy: In a normal elbow (or a truly undisplaced fracture), this line should pass through the middle third of the capitellum ossific nucleus (or just anterior to the middle third in very young children where the capitellum is not fully ossified).

Abnormal (Supracondylar Fracture): In a supracondylar fracture with extension deformity (Gartland Type II or III), the distal fragment is displaced posteriorly and the AHL passes anterior to the capitellum or does not intersect it at all.

Clinical Significance: The AHL is a sensitive indicator of even subtle loss of extension. It helps differentiate:

• True Type I (undisplaced): AHL passes through middle third of capitellum.
• Displaced fracture (Type II/III): AHL passes anterior to capitellum.

It is particularly useful in occult fractures where the fracture line is not visible but the AHL is abnormal, prompting appropriate immobilization and follow-up.

Post-Reduction: After closed reduction, restoration of a normal AHL confirms adequate reduction in the sagittal plane.

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Question 2: How do you assess the Anterior Interosseous Nerve (AIN) in a 5-year-old child with a supracondylar fracture?

Answer: The Anterior Interosseous Nerve (AIN) is a pure motor branch of the median nerve that supplies:

• Flexor Pollicis Longus (FPL): Flexes the interphalangeal joint of the thumb.
• Flexor Digitorum Profundus (FDP) to the index and middle fingers: Flexes the distal interphalangeal joints.
• Pronator Quadratus: Forearm pronation (weak pronation still possible via pronator teres).

Clinical Test - The "OK Sign":

• Ask the child to make an "OK" sign by touching the tip of the thumb to the tip of the index finger, forming a circle.
• This requires active flexion of the IP joint of the thumb (FPL) and the DIP joint of the index finger (FDP).

Interpretation:

• Normal AIN: The child can form a round "O" shape with tip-to-tip contact.
• AIN Palsy: The child cannot flex the IP joints and instead makes a flat pinch using the pulps (pads) of the thumb and index finger. This is called a "pincer pinch" and indicates AIN dysfunction.

Additional Notes:

• In young or distressed children, this test can be challenging. You may need to demonstrate or use play techniques.
• The AIN has no sensory component, so there is no sensory loss with isolated AIN palsy.
• AIN injury in supracondylar fractures is typically neuropraxia (stretch injury) and recovers spontaneously over 3-6 months without intervention.

Other Median Nerve Assessment: To assess the median nerve trunk (not just AIN), also test:

• Sensation: Lateral 3.5 digits (thumb, index, middle, lateral half of ring finger).
• Thenar muscle function: Thumb abduction and opposition (recurrent motor branch of median).

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Question 3: What is Volkmann's Ischaemic Contracture and how do you prevent it?

Answer:

Definition: Volkmann's Ischaemic Contracture is the end-stage sequela of untreated compartment syndrome of the forearm. It represents irreversible ischaemic necrosis and fibrotic contracture of the flexor muscle compartment, with associated median and ulnar nerve damage.

Pathophysiology:

1. Compartment Syndrome: Supracondylar fracture causes bleeding and oedema within the flexor compartment of the forearm (or vascular injury causes ischaemia).
2. Increased Pressure: Intracompartmental pressure rises above capillary perfusion pressure.
3. Muscle Ischaemia: Flexor muscles (FDS, FDP, FPL) undergo ischaemic necrosis.
4. Fibrosis: Necrotic muscle is replaced by scar tissue that shortens over time.
5. Contracture: Fibrous, shortened muscle mass pulls the wrist into flexion and fingers into a claw position.

Clinical Features of Volkmann's Contracture:

• Hand Posture:
  • Wrist: Flexed.
  • MCPJs: Hyperextended.
  • IPJs: Flexed (claw hand).
• Muscle Fibrosis: Palpable firm, contracted flexor compartment.
• Loss of Function: Unable to extend fingers actively (due to flexor contracture) or passively (tight, fibrotic muscles).
• Nerve Damage:
  • Median nerve: Sensory loss in lateral palm, thenar wasting.
  • Ulnar nerve: Sensory loss in medial hand, intrinsic muscle wasting.
• Volkmann's Sign: Passive extension of the wrist (which relaxes the flexors) allows partial passive finger extension. This distinguishes flexor contracture from intrinsic contracture.

Prevention (Critical):

Early Recognition of Compartment Syndrome:

• Clinical Vigilance: High index of suspicion in all displaced supracondylar fractures, especially after reduction or if vascular injury.
• Cardinal Sign: Pain on passive finger extension. This is the earliest and most sensitive sign. Do NOT wait for the "5 Ps" (Pain, Paraesthesia, Pallor, Pulselessness, Paralysis) - these are late.
• Serial Examination: Frequent neurovascular checks in the first 24-48 hours post-injury/post-reduction. Compartment syndrome can develop acutely or over hours.

Immediate Action if Compartment Syndrome Suspected:

1. Remove all constricting dressings and casts immediately - split cast to skin.
2. Reassess - if symptoms persist, diagnosis confirmed.
3. Emergency Fasciotomy - decompress all forearm compartments (volar and dorsal). This is a time-critical emergency. Do not delay for compartment pressure measurement if clinical diagnosis is clear.
4. Leave wounds open - delayed primary closure or skin grafting at 48-72 hours.

Key Point: Volkmann's contracture is a preventable catastrophe. Prompt recognition and treatment of compartment syndrome prevents this devastating outcome. The window for reversible ischaemia is approximately 4-6 hours.

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Question 4: Discuss the management of a 6-year-old with a Gartland Type III supracondylar fracture and a pink pulseless hand.

Answer:

Clinical Scenario:

• 6-year-old child.
• Gartland Type III supracondylar fracture (completely displaced, no cortical contact).
• Pink Pulseless Hand: Radial pulse absent, but hand is warm, pink, with normal capillary refill (less than 2 seconds).

Pathophysiology: The pink pulseless hand indicates:

• Brachial artery compromise: Likely spasm, contusion, or compression (not complete transection).
• Adequate collateral flow: Collateral vessels (recurrent radial, recurrent ulnar, interosseous arteries) are maintaining perfusion to the hand.

Immediate Management:

1. Resuscitation and Analgesia:

   • IV access, analgesia (morphine/fentanyl).
   • Keep child calm and immobilize limb.

2. Detailed Neurovascular Examination and Documentation:

   • Confirm absent radial pulse (palpation and Doppler).
   • Assess hand: Color (pink), temperature (warm), capillary refill (less than 2 sec).
   • Neurological exam: AIN (OK sign), radial (thumbs up), ulnar (cross fingers).
   • Document findings in medical record.

3. Radiographs: AP and lateral elbow X-rays to confirm diagnosis and fracture pattern.

4. NPO (Nil By Mouth): Prepare for urgent surgery.

5. Informed Consent: Discuss with parents:

   • Urgent need for reduction and pinning.
   • Goal: Restore anatomy and relieve pressure on brachial artery.
   • Possible outcomes: Pulse may return, or hand may remain pink pulseless (acceptable), or may deteriorate (rare - requires exploration).

Operative Management:

• Timing: Urgent (within 6 hours ideally, certainly within 12 hours). Not an immediate "middle-of-the-night" emergency, but next available emergency list.
• Procedure: Closed Reduction and Percutaneous Pinning (CRPP) under general anaesthesia.
• Technique:
  1. Gentle longitudinal traction.
  2. Correct medial/lateral displacement.
  3. Correct posterior displacement (anterior pressure on olecranon, posterior pressure on distal fragment).
  4. Flex elbow to 90-120° (avoid hyperflexion which can kink artery).
  5. Pronate forearm to lock reduction.
  6. Fluoroscopic confirmation (AP and lateral): Check AHL, Baumann angle.
  7. Insert 2-3 lateral divergent K-wires (or crossed pins if needed for stability).
  8. Apply above-elbow backslab.

Post-Reduction Reassessment (Critical):

Immediately reassess neurovascular status in recovery room:

• Best Outcome - Pulse Returns: If radial pulse returns and hand remains pink/warm, excellent outcome. Admit for overnight observation with serial neurovascular checks.

• Acceptable Outcome - Hand Remains Pink Pulseless: If hand remains pink, warm, capillary refill less than 2 seconds but radial pulse still absent, this is acceptable. Collateral flow is adequate.

  • Management: Admit for close observation (serial neurovascular checks every 2 hours for 24 hours).
  • Expectation: Most pink pulseless hands remain stable. Pulse may return over hours to days, or may remain absent with continued adequate perfusion.
  • Evidence: Systematic review (Delniotis et al., 2019) supports "watchful expectancy" for pink pulseless hands.

• Concerning Outcome - Hand Becomes White/Cold: If hand becomes pale, cool, capillary refill > 3 seconds (deterioration in perfusion):

  • Emergency: This indicates inadequate collateral flow.
  • Management: Immediate vascular surgery consultation.
  • Procedure: Brachial artery exploration (anteromedial approach to elbow/proximal forearm).
  • Intraoperative Findings and Actions:
    • Arterial spasm: Release, topical papaverine, observe.
    • Arterial thrombosis: Thrombectomy, repair.
    • Arterial laceration/transection: Primary repair or interposition vein graft (reverse saphenous vein).
  • Goal: Restore arterial flow within 6 hours of ischaemia to prevent Volkmann's contracture.

Follow-Up:

• Serial neurovascular checks overnight.
• Monitor for compartment syndrome (pain on passive finger extension, tense forearm).
• If hand remains pink and well-perfused, discharge day 1-2 post-op.
• Pin removal at 3-4 weeks.
• Long-term: Most pink pulseless hands remain asymptomatic. Pulse may or may not return, but collateral flow is sufficient.

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Question 5: What is the Baumann Angle and how is it used in supracondylar fracture management?

Answer:

Definition: The Baumann Angle is a radiographic measurement used on the anteroposterior (AP) X-ray of the elbow to assess the coronal plane alignment of the distal humerus, specifically the relationship between the humeral shaft and the lateral condyle (capitellum).

How to Measure:

1. Obtain a true AP radiograph of the elbow (elbow fully extended, forearm supinated).
2. First line: Draw a line along the long axis of the humeral shaft (midpoint of medullary canal).
3. Second line: Draw a line along the lateral condylar physis (or along the lateral edge of the capitellar epiphysis in older children).
4. Measure the acute angle formed between these two lines on the lateral side.

Normal Values:

• Normal range: 64-81° (mean approximately 72°).
• Symmetry: Baumann angle should be within 5° of the contralateral (uninjured) elbow.

Clinical Significance:

Pre-Operative:

• Assesses degree of varus/valgus malalignment in the fractured elbow.
• Helps plan reduction maneuvers.

Post-Reduction:

• Confirms adequacy of reduction in the coronal plane.
• Goal: Restore Baumann angle to within 5° of the contralateral side.
• Failure to restore Baumann angle is associated with increased risk of cubitus varus (gunstock deformity).

Pitfalls and Limitations:

• Requires true AP view: Rotation of the elbow (internal or external rotation) significantly alters the Baumann angle and can lead to false readings.
• Ossification variability: In very young children (age less than 4 years), the capitellar ossific nucleus may be small or irregular, making measurement difficult.
• Inter-observer variability: Some variability exists between observers. Comparison with contralateral side improves accuracy.
• Not a predictor of long-term function: Baumann angle predicts cosmetic alignment (varus/valgus), but small differences (less than 10°) do not significantly affect elbow function.

Alternative Measurements:

• Lateral Condylar-Humeral Angle: Alternative coronal alignment measure.
• Humerus-Trochlear Angle (HTa): Recent studies suggest this may be more reliable than Baumann angle as it is less affected by elbow rotation.

Clinical Pearl: Always compare with the contralateral elbow when assessing post-reduction radiographs. A Baumann angle within 5° of the uninjured side predicts good cosmetic outcome with minimal risk of cubitus varus.

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13. References

1. Omeroğlu H. Basic principles of fracture treatment in children. Eklem Hastalik Cerrahisi. 2018;29(2):52-57. PMID: 29526160.

2. Zorrilla S de Neira J, Prada-Cañizares A, Marti-Ciruelos R, et al. Supracondylar humeral fractures in children: current concepts for management and prognosis. Int Orthop. 2015;39(11):2287-2296. PMID: 26311512.

3. Flood RJ, Bauer AS, Sullivan BT. Radiographic considerations for pediatric supracondylar humerus fractures. J Pediatr Orthop B. 2023;32(2):110-116. PMID: 35357346.

4. Gartland JJ. Management of supracondylar fractures of the humerus in children. Surg Gynecol Obstet. 1959;109:145-154. (Historical reference - original Gartland classification).

5. Bram JT, DeFrancesco CJ, Pascual-Leone N, et al. Impact of Pediatric Orthopaedic Fellowship Training on Pediatric Supracondylar Humerus Fracture Treatment and Outcomes: A Meta-analysis. J Pediatr Orthop. 2023;43(2):e86-e92. PMID: 36509458.

6. Calogero A, Aulisa AG, Careri S, et al. Evaluation of Gartland Classification, Baumann Angle and Anterior Humeral Line in Paediatrics Supracondylar Fractures: An Inter and Intra-Observer Reliability Study. J Clin Med. 2023;12(3):957. PMID: 38202175.

7. Vincelet Y, Journeau P, Popkov D, et al. The anatomical basis for anterior interosseous nerve palsy secondary to supracondylar humerus fractures in children. Orthop Traumatol Surg Res. 2013;99(5):543-547. PMID: 23916783.

8. Wahlig DN, Sullivan BT, Broida SE, et al. In Supracondylar Humerus Fractures With Nerve Injury, Does Time to Surgery Impact Recovery? J Pediatr Orthop. 2024;44(10):e899-e903. PMID: 39466291.

9. Goh SH, Ong MKL, Lee YH, et al. Systematic review of paediatric pulseless pink humerus supracondylar fractures. J Pediatr Orthop B. 2024;33(5):468-476. PMID: 38189745.

10. Delniotis I, Delniotis C, Saloupis P, et al. Management of the Pediatric Pulseless Supracondylar Humeral Fracture: A Systematic Review and Comparison Study of "Watchful Expectancy Strategy" Versus Surgical Exploration of the Brachial Artery. Ann Vasc Surg. 2019;55:260-271. PMID: 30081162.

11. Kaganur H, Jaisankar M, Sarkar S, et al. Dual Joystick Technique for Reduction of Torsional Profile in Pediatric Supracondylar Humerus Fracture With Delayed Presentation. J Pediatr Orthop. 2024;44(7):414-420. PMID: 38600820.

12. Giray E, Keles E. Pediatric supracondylar humerus fracture with fascicular median nerve injury: The role of neuromuscular ultrasound in diagnosis and management - a case report. J Back Musculoskelet Rehabil. 2024;37(6):1593-1598. PMID: 39970452.

13. Oka K, Shiode R, Iwahashi Y, et al. Association of Clinical Findings With Complications in the Cubitus Varus Deformity After Supracondylar Fracture. J Am Acad Orthop Surg Glob Res Rev. 2024;8(10):e24.00212. PMID: 39401380.

14. Segal D, Cobb K, Little K. Fracture obliquity is a predictor for loss of reduction in supracondylar humeral fractures in older children. J Pediatr Orthop B. 2020;29(2):105-116. PMID: 31033871.

15. Campbell CC, Baker JF, Rees R, et al. Pediatric Lateral Condyle Fractures With Elbow Dislocation: Revisiting the Song Classification of the Most Severe Injuries. J Pediatr Orthop. 2025;45(2):e201-e206. PMID: 39907988.

16. Kadambila R, Karthik BSN, Saikrishna KV, et al. Prone Reduction Technique of Pediatric Gartland Type 2 Extension Supracondylar Fractures of Humerus in an Outpatient Low-Resource Setting. J Orthop Case Rep. 2025;15(1):392-398. PMID: 41281830.

17. Chong AKS, Qureshi M. Pediatric distal humeral supracondylar fracture - achievement of optimal pinning configuration. Acta Orthop Belg. 2022;88(2):245-254. PMID: 36001829.

18. Iwata M, Sakai Y, Katsuda K, et al. Percutaneous pinning through the elbow joint versus cross-pinning for paediatric supracondylar humeral fractures: a retrospective analysis. Eur J Orthop Surg Traumatol. 2025;35(2):895-902. PMID: 40483659.

19. Hosseinzadeh P, Hayes CB. Compartment Syndrome in Children. Orthop Clin North Am. 2016;47(3):579-587. PMID: 27241380.

20. Ozer K. Nerve Lesions in Volkmann Ischemic Contracture. J Hand Surg Am. 2020;45(8):746-757. PMID: 32600789.

21. Chen TL, Cui Y, Shi YL, et al. Humerus trochlear angle (HTa)-a possible alternative for Baumann angle in the reduction of supracondylar humerus fractures. BMC Musculoskelet Disord. 2021;22(1):956. PMID: 34781909.

22. British Orthopaedic Association. BOAST 11: Supracondylar Fractures of the Humerus in Children. 2014 (Updated 2020). Available from: https://www.boa.ac.uk/resources/boast-11-pdf.html

23. Chen RS, He C, Zheng S, et al. Stiffness of various pin configurations for pediatric supracondylar humeral fracture: a systematic review on biomechanical studies. J Pediatr Orthop B. 2015;24(5):389-399. PMID: 25932826.

24. Chen RS, He C, Zheng S, et al. Stiffness of various pin configurations for pediatric supracondylar humeral fracture: a systematic review on biomechanical studies. J Pediatr Orthop B. 2015;24(5):389-399. PMID: 25932826.

25. British Orthopaedic Association Standards for Trauma (BOAST). BOAST 11: Supracondylar Fractures of the Humerus in Children. 2014. [Guideline]

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