Paediatric Medial Epicondyle Fracture ORIF

Indication. Operative fixation of a paediatric medial epicondyle (apophyseal avulsion) fracture is reserved for the absolute indications below. The commonest error is operating purely for displacement, which the modern evidence does not support. ### Absolute indications

• Incarcerated (intra-articular) fragment that does not reduce after closed reduction of the elbow — the fragment blocks motion and will not unite in a functional position.
• Ulnar nerve dysfunction — especially a nerve incarcerated within the joint or a persistent symptomatic neuropathy.
• Open fracture.
• Vascular injury requiring exploration (rare).
• An irreducible elbow dislocation in which the fragment is interposed and prevents reduction. ### Relative indications (the contested ground)
• Significant displacement — the traditional thresholds of greater than 5 mm, greater than 10 mm, and greater than 15 mm are widely debated and are not supported as standalone indications by modern evidence.
• High-demand overhead-throwing athletes in whom valgus stability is critical to function.
• Objective valgus instability on stress testing, indicating incompetence of the ulnar collateral ligament origin.
• A fragment that lies within the cubital tunnel and irritates the ulnar nerve.

Contraindications

Absolute — a fracture without incarceration, nerve compromise, open injury, or demonstrated instability: these do well nonoperatively. Relative — gross swelling or fracture blisters that delay safe surgery, and a near-skeletal-maturity child with a chronic, asymptomatic fibrous nonunion. ## The displacement-threshold controversy Traditional teaching (Smith; Hines) recommended ORIF for displacement greater than 5 mm, with some authors proposing thresholds of greater than 10 mm or greater than 15 mm, citing theoretical risks of nonunion, valgus instability, and ulnar nerve problems. Modern evidence challenges this position: - The Kamath systematic review (2009) found no conclusive evidence that operative treatment of displaced medial epicondyle fractures improves outcome over nonoperative care, and highlighted the lack of high-quality prospective studies.

• Farsetti and colleagues (2001) reported excellent long-term elbow function in patients treated nonoperatively despite residual displacement and frequent fibrous union.
• Josefsson and Danielsson (1986) found that adults reviewed long after childhood nonoperative treatment were largely asymptomatic, even when the fragment had gone on to fibrous union.
• Louahem and colleagues (2010) showed in a multicentre series that long-term outcome was driven by associated elbow injuries and ulnar nerve involvement rather than by the degree of fragment displacement. The defensible modern position is to operate for absolute indications (incarceration, ulnar nerve dysfunction, open injury, instability), to treat the remainder nonoperatively, and to individualise for the high-demand throwing athlete in whom the ulnar collateral ligament origin must be restored. ## Non-operative treatment - A long-arm splint or cast at 90 degrees of flexion for 1 to 3 weeks, followed by early active motion.
• Acceptable for minimally displaced fractures and for displaced fractures that carry no absolute indication.
• Fibrous union is common and is usually asymptomatic; it is not by itself an indication for surgery.
• Counsel the family to expect a minor loss of terminal extension and a small residual cosmetic bump at the medial epicondyle.

Consent specifically for ulnar nerve injury (the commonest nerve problem), stiffness and loss of terminal extension, hardware prominence, infection, and the possibility of an asymptomatic fibrous union if treated nonoperatively. Setup. Supine with the arm on a hand table and the shoulder externally rotated so the medial elbow faces the surgeon (alternatively supine with the arm across the chest over a bolster); a pneumatic upper-arm tourniquet; general anaesthesia with pre-operative antibiotics; and an image intensifier essential throughout.

The goal: through the medial (Hotchkiss) approach, identify and protect the ulnar nerve first, expose the fragment still attached to the flexor-pronator mass, reduce it anatomically, and hold it with a single cannulated screw and washer — restoring the ulnar collateral ligament origin. The exposure is laid out in full below, because nerve-safe dissection is the whole game.

View larger

Fixation alternatives For very small or comminuted fragments, use K-wires with a tension band, or suture fixation of the flexor-pronator origin to the distal humerus.

Variations for special situations Incarcerated fragment. After reducing any elbow dislocation, recognise the fragment trapped within the joint using the CRITOE order and a true lateral film. Extract it carefully while protecting the ulnar nerve and the articular cartilage, fix it anatomically, and explore the ulnar nerve, which may be symptomatic or incarcerated alongside the fragment. Ulnar nerve management. Document nerve status pre-operatively. Intra-operatively, decompress the cubital tunnel and transpose the nerve anteriorly (subcutaneous) when there is pre-operative neuropathy, severe compression, or incarceration. Confirm after fixation that the nerve does not sublux over the screw or washer. Overhead-throwing athlete. An acute displaced fracture in a thrower deserves a lower threshold for anatomic fixation to restore the UCL origin. Counsel on a delayed return to throwing and on age-appropriate pitching-load limits (rest days and pitch counts). Elbow dislocation. Reduce the dislocation first, then reassess the fragment and the neurovascular status. Fix the fragment if it is incarcerated or unstable, and use a brief period of protected motion to limit the stiffness that follows a paediatric elbow dislocation.

Rehabilitation | Phase | Timing | Immobilisation | Activity | |-------|--------|----------------|----------| | 1 | 0 to 4 weeks | Long-arm splint or cast at 90 degrees, forearm neutral | Elevation and simple analgesia; finger active motion; radiographs at 1 to 2 weeks | | 2 | 4 to 6 weeks | Removable splint; avoid valgus stress | Begin active then active-assisted elbow range of motion | | 3 | 6 to 8 weeks | Splint for heavy tasks only | Progressive motion and light strengthening once union is advancing | | 4 | 8 to 16 weeks | Night splint only if needed | Non-contact sport from 8 to 12 weeks; progressive throwing from about 3 months | Avoid valgus stress for the first 6 weeks to protect the UCL origin. Non-contact activities resume from around 8 to 12 weeks once motion and strength are full and pain-free. Overhead throwing is delayed: a progressive throwing programme typically begins no earlier than 3 months, with full competitive pitching often at 4 to 6 months. Complications

The medial epicondyle — an apophysis. The medial epicondyle is a traction APOPHYSIS on the posteromedial distal humerus, not a true epiphysis. It contributes little to longitudinal growth, so growth disturbance is uncommon after injury or fixation. It ossifies around 5 to 7 years of age (girls earlier than boys) and fuses to the distal humeral metaphysis around 13 to 15 years. CRITOE — the order of ossification of the elbow. Capitellum, Radial head, Internal (medial) epicondyle, Trochlea, Olecranon, External (lateral) epicondyle. The medial epicondyle ossifies BEFORE the trochlea — the anatomical basis of the incarceration imaging trap.

Musculoligamentous attachments. The flexor-pronator mass origin (pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, and flexor digitorum superficialis) and the ulnar collateral ligament origin (the anterior bundle is the prime static restraint to valgus) both arise from the medial epicondyle. The avulsion occurs because acute valgus stress tensions the flexor-pronator mass and the UCL, levering the apophysis off the distal humerus. The ulnar nerve. The ulnar nerve courses posterior to the medial epicondyle through the cubital tunnel, immediately deep to the operative field. It may be displaced distally with the fragment or, rarely, incarcerated within the joint alongside it. Pre-injury ulnar nerve symptoms occur in a substantial minority of these fractures, so the nerve must always be identified and protected. Associated injuries to exclude. Elbow dislocation (common — assess and reduce first), a lateral condyle fracture (do not miss, as it requires its own management), a radial neck fracture, an olecranon fracture, and an extension-type supracondylar fracture. Document the ulnar nerve and the vascular (brachial artery) status before and after any reduction.

Key evidence — the displacement controversy. The consistent message across four decades of study is that operating purely for displacement is not supported. Kamath (2009), in a systematic review, found no conclusive evidence that operative treatment improves outcome over nonoperative care. Farsetti (2001) reported excellent long-term elbow function despite residual displacement and frequent fibrous union, and Josefsson and Danielsson (1986) confirmed that adults reviewed long after childhood nonoperative treatment were largely asymptomatic. Louahem (2010) showed that long-term outcome was driven by associated elbow injuries and ulnar nerve involvement rather than by displacement. Hines (1987) anchored the traditional operative approach with reliable ORIF results, but the displacement thresholds that work informed are now applied more selectively — operate for incarceration, nerve dysfunction, open injury, or instability.