Comparative study of three different combination surgical methods for recurrent patella dislocation

Purpose: The effects of different combination of surgical techniques for recurrent patella dislocation (RPD) remain unclear. Thus, aim of this study was to investigate the surgical outcomes of different combination of surgical techniques for RPD. Methods: The clinical data of 79 patients with RPD from August 2014 to October 2016 were analysed retrospectively. Knee joint was assessed according to measurements of the congruence angle (CA), patellar tilt angle (PTA) and lateral patellofemoral angle (LPFA). Knee function was evaluated by Kujala patellofemoral score, Lysholm knee score and Tegner score. Patients were followed up by out-patient examination and telephone till October 2018. Results: Preoperative clinical characteristics were similar across groups. It was statistically insignificant among three groups in CA, PTA, LPFA and redislocation rate. In term of knee functions, the MPFL reconstruction and LPR release group had the highest score (Lysholm score: 91.82 +/- 4.64, Kujala score: 94.22 +/- 4.26, Tegner score: 5.80 +/- 1.00, respectively) and the LPR release and MPR plication had the lowest score (Lysholm score: 78.10 +/- 6.90, Kujala score: 80.91 +/- 4.30, Tegner score: 4.98 +/- 1.22, respectively). Conclusion: Three combinations of surgical methods were similar in terms of postoperative joint congruence and redislocation rate, but MPFL reconstruction combined with LPR release is worthy to be promoted with the highest knee function scores. (C) 2020 The Japanese Orthopaedic Association. Published by Elsevier B.V. All rights reserved.