Investigate the functional outcome of medial patellofemoral ligament (MPFL) surgery for patella instability. Compare functional outcome of direct MPFL repair and reconstruction using hamstring graft. All patients that underwent MPFL surgery for patella instability between 2007-2010 were retrospectively identified from operative records. Patients were divided based on whether they underwent direct repair of MPFL, or reconstruction using hamstring graft. The Kujala scoring questionnaire for patellofemoral disorders (max score 100) was used to assess their functional outcome following surgery.Purpose
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