All the data of patients with patellar dislocation will be collected to evaluate the anatomic deformities. The data includes X-ray, CT, MRI examinations, medical records, and physical examination information. Finally, we correlate the anatomic deformities with clinical efficacy. To search for the risk factors that lead to patellar dislocation and influence the therapeutic effect.
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Number of participants with redislocation of their patella after surgery as confirmed by clinical physical examination
Timeframe: Three years after surgery
International Knee Documentation Committee(IKDC) score
Timeframe: Three years after surgery
Magnatic Resonance Imaging evaluation
Timeframe: Three years after surgery