Abstract:Objective: To retrospectively analyze the mid-term clinical results of medial patellofemoral ligament (MPFL) reconstruction in the treatment of recurrent patellar dislocation (RPD) with trochlear dysplasia. Methods: From January 2013 to December 2016, 26 patients with recurrent patella dislocation accompanied by trochlear dysplasia underwent arthroscopy-assisted MPFL double-bundle reconstruction. Selective patellar lateral retinaculum release was performed. Dejour classification was used to evaluate the grade of chute dysplasia. The Kujala score, Lysholm score, and Tegner score were used to evaluate knee function before and after the operations, and patient satisfaction was investigated. Results: 22 cases (26 knees) were followed up, and 4 cases were lost to follow-up. The average follow-up time was 5.2 years (3.2-6.8 years). Twenty-two patients had trochlear dysplasia according to Dejour type, 10 cases of type A, 5 cases of type B, 4 cases of type C, and 3 cases of type D. There were no cases of redislocation. 20 patients could return to exercise and were satisfied with the treatment effect. The Kujala score, Lysholm score, and Tegner score were significantly improved at the last follow-up than before surgery (P <0.001),and there were no significantly difference between the mild trochlear dysplasia group(Dejour A type)and high-grade trochlear dysplasia group(Dejour B,C,D type)(P >0.05). Conclusion: The mid-term effect of MPFL reconstruction for the treatment of recurrent patella dislocation with trochlear dysplasia is satisfactory. Surgical efficacy has no significant correlation with trochlear dysplasia.