Treatment of supracondylar humerus in children

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Supracondylar Humerus Fractures in Children

Supracondylar humerus fractures are the most common elbow fractures in children, with peak incidence between ages 5-7. Extension-type (posterior displacement) accounts for ~97-98% of cases; flexion-type is rare (~2%).

Mechanism and Clinical Presentation

Extension type: Fall on an outstretched hand with the elbow extended or hyperextended. The triceps pulls the distal fragment posteriorly and proximally. The child holds the arm at the side with a characteristic S-shaped deformity. The sharp proximal fragment may threaten the anterior neurovascular structures (brachial artery, anterior interosseous nerve/median nerve).

Flexion type: Direct blow to the posterior aspect of the flexed elbow. The distal fragment displaces anteriorly. The child supports the forearm with the opposite hand, elbow at 90 degrees. Ulnar nerve injury occurs in over 90% of flexion-type cases.

Radiographic Assessment

Two key measurements guide diagnosis and reduction quality:

1. Anterior humeral line - drawn along the anterior cortex of the humerus on a lateral film. Normally transects the middle third of the capitellum. In extension supracondylar fractures, it passes through the anterior third or entirely anterior to the capitellum.

$Lateral elbow X-ray showing supracondylar fracture with fat pad sign$

Fig. Supracondylar fracture (arrow) with anterior and posterior fat pad - Rosen's Emergency Medicine

$Anterior humeral line: normal (A) vs extension fracture (B)$

Fig. Anterior humeral line: (A) normally transects mid capitellum; (B) passes anterior in extension-type fractures - Rosen's Emergency Medicine

2. Baumann's angle - intersection of the humeral mid-shaft axis with the capitellar physis on AP film, normally ~75 degrees. Asymmetry indicates varus/valgus malreduction.

Soft tissue signs: A posterior fat pad sign on lateral film, or an abnormal anterior humeral line, may be the only evidence of a minimally displaced fracture. Comparison views of the contralateral elbow are often useful in children.

CRITOE mnemonic (ossification center appearance sequence):

Center	Age of Appearance
Capitellum	1-2 years
Radial head	4-5 years
Internal (medial) epicondyle	4-5 years
Trochlea	8-10 years
Olecranon	8-9 years
External (lateral) epicondyle	10-11 years

Classification: Gartland (Modified)

Type	Description
Type I	Non-displaced or minimally displaced; posterior cortex intact
Type IIA	Displaced, posterior cortex intact, no rotational component
Type IIB	Displaced, posterior cortex intact, with rotational component
Type III	Completely displaced; no cortical contact; periosteal contact remains
Type IIIA	No rotation
Type IIIB	Rotation present
Type IV	Complete circumferential periosteal disruption; multidirectionally unstable

Treatment by Type

Type I (Non-displaced)

Immobilize in a posterior splint or long-arm cast with elbow flexed 75-80 degrees, forearm in neutral rotation
Protected range of motion begins at ~3 weeks
Discharge from ED with instructions to elevate, apply ice, and follow up in 1-2 days
Even without definite radiographic fracture, a child with localized tenderness consistent with a supracondylar fracture should be splinted and reviewed within 24-48 hours
Source: Rosen's Emergency Medicine, Bailey and Love's

Type IIA (Displaced, no rotation, posterior cortex intact)

Closed reduction under procedural sedation
If the dorsal periosteal hinge is intact, above-elbow cast immobilization for 3-4 weeks is often sufficient to hold the reduction
Elbow flexion to 110-120 degrees uses the intact posterior periosteum as a tension band
If swelling prevents this degree of flexion, do not force it - this risks vascular obstruction
Admit for neurovascular monitoring during first 24-48 hours when swelling peaks
Source: Rosen's Emergency Medicine, Bailey and Love's

Type IIB (Displaced with rotation)

Closed reduction + percutaneous K-wire (Kirschner wire) pinning is recommended
Studies show better outcomes with pinning than without for IIB fractures
Above-elbow cast applied after pinning
Source: Rosen's Emergency Medicine

Type III (Completely displaced)

Closed reduction and percutaneous pinning (CRPP) is the gold standard
Operative timing: urgent, though not all centers require "emergent" same-night surgery - evidence supports safe delay to next morning with close neurovascular monitoring for stable type III injuries (without vascular compromise)
If closed reduction fails: open reduction via anterior (cubital) or lateral approach
Admit for neurovascular observation; risk of compartment syndrome highest at 24-48 hours
Source: Rosen's Emergency Medicine, Campbell's Operative Orthopaedics

Type IV (Circumferential periosteal disruption)

Emergent orthopedic consultation and operative intervention
These are surgically challenging but good outcomes are achievable
Source: Rosen's Emergency Medicine

Percutaneous Pinning Technique

Standard technique: two or three lateral-entry K-wires (all from lateral side), or cross-pinning (one medial + one lateral)
Lateral-entry pins are preferred by most surgeons - they avoid iatrogenic ulnar nerve injury while providing adequate stability when divergent configuration is used
Cross-pin (medial + lateral) provides better rotational stability biomechanically but risks ulnar nerve injury with the medial pin
If medial pin is used, the elbow should be extended (not fully flexed) to protect the ulnar nerve
Recent network meta-analysis (Lin et al., 2026, PMID 41076056) examined optimal pin configurations, with biomechanical data favoring three lateral pins for most fractures
Pins are typically removed in clinic at 3-4 weeks once early healing is confirmed

Neurovascular Injuries

Nerve injuries occur in ~10% of extension-type fractures overall, rising to 20-50% with increasing displacement severity. Most are neuropraxias that resolve with fracture reduction and swelling subsidence. Motor function typically returns within 7-12 weeks; sensory recovery can take over 6 months.

Fracture Type	Most Common Nerve Injury
Extension type	Anterior interosseous nerve > radial nerve > median nerve
Flexion type	Ulnar nerve (>90% of cases)

Vascular Injury

Pulseless hand occurs in ~10% of cases (usually swelling, not direct arterial injury). Two scenarios:

White pulseless hand: Surgical emergency. Requires immediate assessment and urgent reduction. If pulse does not return after reduction, vascular exploration by a vascular surgeon is mandatory.
Pink pulseless hand (adequate perfusion): More controversial. If there is satisfactory perfusion, no compartment syndrome, and no neurological injury, fracture reduction and stabilization with a more expectant approach is acceptable. The pulse often returns within 24-48 hours.

Complications

Complication	Notes
Volkmann's ischaemic contracture	Rare but feared. Due to excessive swelling and missed compartment syndrome. Do NOT place elbow in deep flexion with significant swelling; use K-wire fixation instead
Cubitus varus (gunstock deformity)	Most common malunion. Due to varus malreduction. More cosmetic than functional. Corrected by supracondylar osteotomy if severe
Cubitus valgus	Less common malunion
Compartment syndrome	Risk peaks at 24-48 hours post-injury; monitor carefully after reduction
Iatrogenic ulnar nerve injury	Risk with medial-entry pin; use lateral-only configuration when possible
Stiffness	Usually resolves with time; avoid prolonged immobilization

Flexion-Type Fractures (Special Considerations)

Immobilize in extension (not flexion) - anterior periosteum acts as tension band
Type I: splint comfortably flexed, no need for extension immobilization
Types II and III: emergent orthopedic consultation; closed reduction and percutaneous pinning; open reduction if CR fails
Ulnar nerve is at highest risk

Summary Algorithm

Supracondylar fracture identified
         |
    _____|______
   |            |
Type I       Types II-IV
   |            |
Splint       Neurovascular assessment FIRST
75-80°          |
Outpatient   Pulseless/ischemic → emergent
             ________________________
            |                        |
          Type IIA                Type IIB/III
          CR + cast             CRPP (lateral K-wires)
          (if hinge intact)      Admit/monitor
            |
          Type IV
          Emergent OR

Sources:

Rosen's Emergency Medicine, Ch. 44 (Pediatric Extremity Fractures)
Bailey and Love's Short Practice of Surgery, 28th Ed., Ch. 32
Campbell's Operative Orthopaedics, 15th Ed. 2026 (SUPRACONDYLAR FRACTURES section)

Recent evidence: A 2026 network meta-analysis (PMID 41076056) on pin configuration optimization suggests three lateral-entry pins offer superior biomechanical stability. No major departures from established management principles were identified in 2024-2026 systematic reviews.

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