Minimizing Redislocation Rates and Restoring Function After Patella Dislocation: A Critically Appraised Topic

Abstract

Clinical Scenario: Patella dislocation is a common knee injury resulting in decreased function, increased knee pain, and a higher risk of recurrent patella dislocation. Patients with patella instability are treated surgically or conservatively with physical therapy to minimize redislocation risk and restore function. Clinical Question: In individuals with a patella dislocation, how does treatment (conservative therapy versus medial patellofemoral ligament [MPFL] surgery) affect redislocation rates and patient-perceived function? Summary of Key Findings: This critically appraised topic included 3 studies assessing outcomes in individuals with patella instability treated with MPFL surgery or conservative management. Outcomes included comparing redislocation rates and Kujala scale perceived knee function between participant groups. Surgery included MPFL reconstruction (MPFL-R) in 1 randomized controlled trial and 1 prospective controlled trial and MPFL repair in another randomized controlled trial. Conservative treatment included physical therapy and bracing. All 3 studies demonstrated significantly lower redislocation rates in individuals managed with surgery versus conservative treatment. Reported knee function was significantly higher in the MPFL-R group compared with individuals conservatively managed at 2-year follow-up but not at 1 year. No significant difference in knee function was present between individuals receiving MPFL repair or conservative management at a 2-year follow-up. Clinical Bottom Line: There is moderate-level evidence to support a significant decrease in patella redislocation rates in individuals managed with MPFL surgery compared with conservative treatment. The reviewed studies suggest a significant improvement in patient-perceived knee function at 2 years following MPFL-R but no difference at 1 year following MPFL-R or 2 years after MPFL repair. Strength of Recommendations: Grade B evidence supports lower patella redislocation rates with MPFL surgery compared with nonsurgical treatment. Furthermore, this evidence suggests a potential benefit in perceived knee function 2 years after MPFL-R compared with conservative management.