Treatment of supracondylar humerus fracture in children

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"supracondylar humerus fracture" AND children AND treatment

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Supracondylar Humerus Fracture in Children

Overview

Supracondylar humerus fractures are the most common elbow fractures in children and the most common fracture requiring surgery by pediatric orthopedic surgeons. The peak incidence is at age 5-7 years. The vast majority (95-98%) are extension-type (posterior displacement of the distal fragment), caused by a fall on an outstretched hand with the elbow in hyperextension. Flexion-type fractures are rare (<5%) and occur from a direct blow to the posterior elbow.

Rosen's Emergency Medicine, p. 3305
Campbell's Operative Orthopaedics 15th Ed 2026
Bailey and Love's Short Practice of Surgery 28th Ed, p. 462

Gartland Classification (Extension-Type)

Type	Description
I	Non-displaced fracture
II	Displaced with intact posterior cortex
IIA	No rotational deformity
IIB	With rotational deformity
III	Displaced with NO cortical contact
IIIA	Posteromedial rotation of distal fragment
IIIB	Posterolateral rotation of distal fragment

Rosen's Emergency Medicine, Table 170.3

Initial Assessment - Neurovascular Examination (MANDATORY)

Before any treatment, a complete neurovascular exam is required. The elbow is in close proximity to the brachial artery and three major nerves:

Anterior interosseous nerve (AIN) - branch of median nerve, most commonly injured in extension fractures (posterolateral displacement)
Radial nerve - injured with posteromedial displacement
Ulnar nerve - injured with flexion-type fractures; also at risk during medial pin placement
Brachial artery - at risk with displaced fractures

Signs of vascular compromise: the 5 Ps - Pain, Pallor, Pulselessness, Paralysis, Paresthesias. Worsening pain or pain with passive finger extension is a warning sign of compartment syndrome and Volkmann ischemic contracture.

Imaging

AP and lateral elbow X-rays are standard
Look for fat pad signs: an anterior fat pad "sail sign" or posterior fat pad elevation indicates hemarthrosis and occult fracture even when bone displacement is not obvious
The Baumann angle (normal ~70-75° on AP view) and the anterior humeral line (on lateral view, should pass through the middle third of the capitellum) are used to assess fracture alignment and reduction adequacy

Baumann angle in a normal elbow (AP radiograph)

The CRITOE mnemonic helps interpret ossification centers around the elbow:

Center	Appears
Capitellum	6-12 months
Radial head	4-5 years
Internal (medial) epicondyle	5-7 years
Trochlea	8-10 years
Olecranon	8-9 years
External (lateral) epicondyle	9-13 years

Treatment by Gartland Type

Type I - Non-displaced

Posterior long-arm splint with elbow at 90° flexion, forearm in neutral or pronated position
Immobilize for 3 weeks
Follow-up with orthopedics within 24 hours for evaluation and casting
Progressive mobilization after union

Type II - Displaced with intact posterior cortex

Closed reduction is performed
If reduction can be maintained with <90° of elbow flexion: above-elbow cast for 3-4 weeks
If >90° flexion is required to hold reduction: percutaneous K-wire (Kirschner wire) fixation + above-elbow cast - deep flexion risks vascular compromise, especially with significant swelling

Type III - Completely displaced (no cortical contact)

Admission and operative treatment
Standard of care: Closed Reduction and Percutaneous Pinning (CRPP) under general anesthesia with fluoroscopic guidance
If closed reduction fails: open reduction and internal fixation (ORIF)

Surgical Technique: Closed Reduction and Percutaneous Pinning (CRPP)

Reduction maneuver:

Apply steady inline traction with forearm in neutral ("thumb-up" position) to restore length
Correct medial/lateral displacement by pushing the fragment in the appropriate direction
Place thumb over the anterior surface of the proximal fragment with fingers behind the olecranon and gently flex the elbow
Immobilize with forearm pronated (for laterally displaced fractures) or supinated (for medially displaced fractures)

Pin configuration:

Two lateral divergent pins - reduces ulnar nerve injury risk; most commonly used
Cross-pin configuration (one lateral + one medial) - provides greater torsional stability but risks ulnar nerve injury if medial pin is placed without direct visualization of the nerve

Pins are typically removed at 3-4 weeks and active range of motion begins.

Special Situations: Vascular Injuries

White pulseless hand:

Surgical emergency
Requires immediate reduction to attempt to restore blood flow
If pulse does not return after reduction: urgent vascular exploration by a vascular-trained surgeon

Pink pulseless hand (perfused but no radial pulse):

More controversial management
If there is satisfactory limb perfusion, no compartment syndrome, and no neurological injury: perform fracture reduction and stabilization with an expectant approach to the vascular injury
Pulse often returns within 24-48 hours as swelling resolves
Serial vascular monitoring is mandatory
Bailey and Love's, p. 462

Complications

Complication	Notes
Volkmann ischemic contracture	Rare but devastating; from missed compartment syndrome due to excessive swelling, often from placing elbow in deep flexion
Cubitus varus ("gunstock deformity")	Most common long-term complication; due to malunion in varus; cosmetically deforming but rarely functionally significant. Requires corrective supracondylar osteotomy if severe
Cubitus valgus	Less common; risk of delayed ulnar nerve palsy
Neurological injury	Most are neuropraxia; resolve after reduction and swelling resolution
Pin-tract infection	Managed with pin removal at appropriate time
Elbow stiffness	Usually resolves with time and physiotherapy

Key Surgical Timing Points

Fractures with neurovascular compromise require emergency surgery
For stable fractures with intact vasculature, surgery within 12-24 hours is acceptable and does not increase complication rates compared to immediate fixation
Overnight observation with repeat neurovascular checks is appropriate for closed fractures with no vascular compromise

Recent Evidence (2023-2026)

A 2026 network meta-analysis (PMID 41076056) on biomechanical optimization of pediatric supracondylar humerus fracture fixation examined different pin configurations and supports that lateral-only pinning with appropriately placed divergent pins provides sufficient stability while minimizing ulnar nerve risk - consistent with current clinical practice guidelines.

Summary treatment algorithm:

Type I → Splint/cast, 3 weeks
Type II, stable → Closed reduction + cast
Type II, unstable / Type III → CRPP (gold standard)
Vascular compromise → Emergency reduction ± vascular exploration
Failed closed reduction → Open reduction
Sources: Campbell's Operative Orthopaedics 15th Ed 2026, Rosen's Emergency Medicine, Bailey and Love's Short Practice of Surgery 28th Ed

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