Management of Minimally Displaced Impacted Radial Head Fracture
Treat minimally displaced impacted radial head fractures non-operatively with immediate active mobilization—no immobilization, no formal physical therapy required.
Treatment Protocol
The evidence strongly supports conservative management for this injury pattern:
- Immediate active range of motion is the standard of care 1, 2
- No immobilization period needed - 90.2% of experienced surgeons favor immediate mobilization over any period of immobilization 3
- Self-directed home exercises are sufficient - formal physical therapy provides no additional benefit and is not cost-effective 4
Evidence Supporting Early Mobilization
The superiority of immediate mobilization is well-established. When comparing immediate versus 5-day delayed mobilization, patients who started moving immediately had 5:
- Less pain at 7 days (VAS 6 vs 7.6)
- Greater flexion (112° vs 98°)
- Better supination strength
- Superior elbow function scores (Morrey Score: 54 vs 43)
By 4 weeks, outcomes equalized between groups, but the early functional advantage favors immediate movement 5.
Physical Therapy Considerations
A prospective randomized trial definitively showed that formal physical therapy is unnecessary 4. Patients performing self-directed home exercises actually demonstrated:
- Better early function at 6 weeks (lower DASH scores, p=0.021)
- Equivalent outcomes at 3 months, 6 months, and final follow-up
- No differences in pain, range of motion, or healing time
This makes prescribing formal PT not cost-effective for isolated minimally displaced fractures 4.
Key Clinical Criteria
Before proceeding with non-operative management, verify:
- No mechanical block to pronation/supination - this would mandate surgical intervention 1, 2
- Displacement <2mm - greater displacement without mechanical block remains controversial but may still be managed conservatively 1
- Isolated injury - carefully assess for associated injuries (ligamentous, other fractures) which would alter management 2
Common Pitfalls to Avoid
Do not immobilize these fractures. Only 9.8% of surgeons still use initial immobilization, representing outdated practice 3. The radial head is a secondary stabilizer, and early motion prevents stiffness without compromising healing 1.
Do not reflexively order physical therapy. Level II evidence demonstrates this adds no value for isolated minimally displaced fractures 4. Reserve PT for complex injuries or patients unable to perform self-directed exercises.
Do not miss associated injuries. Comminution and complete loss of cortical contact are associated with high rates of ligamentous or other bony injuries 1. If the clinical picture doesn't match a simple isolated fracture, consider CT imaging to evaluate for occult injuries 6.
Expected Outcomes
All minimally displaced fractures unite by 3 months with conservative management 5. Final extension deficits are minimal (mean 2-3°) and function is excellent by Morrey Score criteria 5. The vast majority of radial head fractures are managed non-operatively with excellent results 7, 8.