Treatment of Significantly Displaced Medial Epicondyle Fractures
For significantly displaced medial epicondyle fractures (>5-10mm displacement), open reduction and internal fixation with a single cannulated screw is the recommended treatment to restore elbow stability, promote union, and enable early mobilization.
Treatment Algorithm Based on Displacement
The decision-making for medial epicondyle fractures follows a displacement-based approach:
- <2mm displacement: Immobilization with long arm cast for 4 weeks
- 2-5mm displacement: Gray zone - consider patient age, activity level, and elbow stability; either casting or surgery acceptable
- >5-10mm displacement: Strong consideration for surgical fixation
- >15mm displacement: Surgery recommended 1
For each additional millimeter of displacement, the odds of requiring surgical intervention increase 6.4-fold 2, making displacement the single most important factor in treatment decisions.
Absolute Indications for Surgery
Proceed directly to open reduction and internal fixation if any of these are present:
- Intraarticular fragment incarceration in the joint 3, 1
- Complete ulnar nerve lesion or entrapment 3, 1
- Open fracture 1
- Frank elbow instability 1
- Associated elbow dislocation with significant displacement 4
Surgical Technique
Use a single cannulated cancellous screw without a washer for fixation 5. The evidence strongly favors this approach:
- Screw alone provides adequate compression and stability
- Adding a washer increases hardware prominence complaints by 58% versus 0% (P=0.04) and significantly increases the need for secondary surgery for hardware removal 5
- No cases of fragment fragmentation or penetration occur with screw-alone fixation 5
- Place the screw across the epicondyle into the medial column, avoiding the olecranon fossa 5
Alternative fixation methods include:
- Kirschner wires for young children or small fragments 3, 6
- Suture anchors (emerging technique) 1
- Antiglide plate for larger fragments 6
Post-Operative Management
- Immobilize for 2 weeks maximum after screw fixation (versus 4+ weeks for casting alone) 4
- Remove screw at 8-12 weeks 3
- Expect union by approximately 12 weeks 6
- Physiotherapy only if marked reduction in elbow mobility persists 6 weeks after cast removal 3
Evidence Reconciliation: Surgery vs. Casting
The most recent high-quality evidence shows noninferiority of casting versus surgery at 12 months for functional outcomes 7. However, this finding requires careful interpretation:
Critical differences favoring surgery:
- Union rate: 97.3% with surgery versus 31.4% with casting 7
- Earlier mobilization: 2 weeks versus 4+ weeks 4
- Better for athletes requiring elbow stability 2, 3
Considerations favoring casting:
- Better cosmetic appearance (8.9-point difference on VAS, P<0.001) 7
- Avoids surgical risks including ulnar nerve injury (6.4% incidence) 8
- No hardware removal needed (13% of surgical patients require secondary surgery) 8
Clinical Decision Framework
Operate if:
- Displacement >10mm in any patient
- Displacement >5mm AND patient is an athlete or >12 years old
- Any absolute indication present (see above)
- Dominant arm involvement with >5mm displacement
Consider casting if:
- Displacement <5mm
- Patient <10 years old with <10mm displacement
- Non-dominant arm
- Low athletic demands
- Family preference after informed discussion of 70% nonunion risk 7
Common Pitfalls
- Don't add a washer to screw fixation - this dramatically increases hardware prominence and need for removal 5
- Don't delay surgery beyond 2 weeks if operating - acute injuries have better outcomes 6
- Screen for glenohumeral internal rotation deficit (GIRD) - present in 42% of cases and suggests preventable overuse injury 2
- 84% of patients report pre-existing elbow pain before acute fracture 2 - this is often a preventable progression of Little League elbow
- Always examine the ulnar nerve - injury occurs in 6.4% of surgical cases 8
Expected Outcomes
Both surgical and nonsurgical approaches yield excellent functional results when appropriately selected:
- Mayo Elbow Performance Scores: 95.2±6.0 (surgery) versus 98.6±0.7 (casting) 8
- Range of motion: Flexion averages 133° with <2° extension deficit 8
- All patients return to sports 2
- Recurrent elbow pain rates similar between groups 2
The key distinction is that surgery provides 9-fold higher union rates 6 while casting accepts fibrous nonunion in exchange for avoiding surgical risks and achieving similar functional outcomes at 1 year 7.