Does Degree of Trochlear Dysplasia and Position of Femoral Tunnel Influence Outcome After Medial Patellofemoral Ligament Reconstruction

Background:The medial patellofemoral ligament (MPFL) is the main restraining force against lateral patellar displacement. It is disrupted after patellar subluxation or dislocation. Reconstruction of the MPFL is frequently performed when nonoperative management fails and the patient experiences recurrent patellar dislocation.Purpose:To determine the relationship between the degree of trochlear dysplasia and femoral tunnel position and outcome after MPFL reconstruction.Study Design:Case series; Level of evidence, 4.Methods:A total of 68 patients (72 knees) with recurrent dislocation of the patella underwent MPFL reconstruction. The mean follow-up was 31.3 months (range, 13-72 months). Clinical and functional outcomes were recorded using the Kujala, Lysholm, and Tegner scores. Postoperative complications, participation in sporting activity, and overall patient satisfaction were determined. Radiographs were analyzed to evaluate congruence angle, lateral patellofemoral angle, patellar height, trochlear dysplas...