Bracing for Recurrent Patellar Dislocation in a 14-Year-Old While Awaiting MRI
Yes, using either the DonJoy Playmaker or DryTech ROMSTOP brace locked at 0-30° is acceptable while awaiting MRI in a 14-year-old with recurrent patellar dislocation, though the motion-restricting brace offers no proven advantage over simpler bracing and may cause more harm.
Evidence-Based Recommendation
Based on the highest quality recent evidence, a simple neoprene nonhinged knee brace is actually preferable to a motion-restricting brace for this patient 1. The 2022 randomized controlled trial comparing these exact brace types found that motion-restricting braces (locked at 0-30°) provided no reduction in redislocation rates compared to simple neoprene braces (34.4% vs 37.5%, not statistically significant), but caused significant complications 1.
Key Problems with Motion-Restricting Braces (0-30° ROM)
The motion-restricting approach causes:
- More quadriceps muscle atrophy at 4 weeks (75% vs 50% of patients, P=0.048) 1
- Significantly reduced knee range of motion at 4 weeks (90° vs 115°, P<0.001) and 3 months (125° vs 133°, P=0.028) 1
- Worse functional outcomes at 6 months (Kujala score difference of 4.6 points, P=0.012) 1
Practical Bracing Approach
If you already have the DonJoy Playmaker or ROMSTOP brace:
- Use it, but do not lock it at 0-30°—allow full range of motion
- The Playmaker specifically has been shown to effectively reduce dynamic valgus stress without restricting motion 2
- Both braces are acceptable for temporary stabilization while awaiting MRI
Better alternative:
- A simple neoprene sleeve or patellofemoral brace without motion restriction provides equivalent stability with fewer complications 1
Management Algorithm While Awaiting MRI
Immediate (First 4 Weeks)
- Brace continuously for 4 weeks—either option is acceptable, but avoid locking ROM 3
- Start physical therapy within the first month (99% consensus recommendation) 3
- Obtain knee radiographs if not already done (99% consensus) 3
Common Pitfall to Avoid
Do not immobilize the knee—this is the critical error. The evidence clearly shows that restricting motion to 0-30° causes quadriceps atrophy and stiffness without preventing redislocation 1. The goal is patellar stabilization while maintaining knee mobility.
Why MRI Matters for This Patient
With recurrent patellar dislocation (not first-time), MRI is particularly important because:
- 95% sensitivity for confirming patellar instability 4
- Identifies MPFL tears (found in 68% of cases) 4
- Detects osteochondral lesions (present in 20.5% of acute cases, higher in recurrent) 4
- Adolescents with osteochondral fractures have 66.7% recurrence rate vs 27.8% without 5
What MRI Will Guide
The MRI findings will determine if this patient needs:
- Continued conservative management with physical therapy
- Surgical MPFL reconstruction (if anatomic risk factors present)
- Osteochondral fracture fixation (if present)
Long-Term Context
Recent 10-year follow-up data shows that in pediatric patients with first-time dislocation, the redislocation rate is high regardless of initial treatment (80% with bracing alone, 62% with MPFL repair) 6. However, your patient has recurrent dislocations, which places them at even higher risk and likely warrants surgical consideration after MRI evaluation.
Bottom line: Use whichever brace you have available, but allow full range of motion, start physical therapy immediately, and expedite the MRI to guide definitive treatment planning.