Medial Patellofemoral Ligament Reconstruction Using the Autogenous Hamstring Tendon for Recurrent Patellar Instability: A Preliminary Report

ABSTRACT

PURPOSE: We present the short-term results of medial patellofemoral ligament (MPFL) reconstruction using the autogenous hamstring tendon for recurrent patellar instability. MATERIALS AND METHODS: Seven patients with recurrent patellar instability were treated with MPFL reconstruction using a semitendinosus or gracilis autograft from February 2008 to November 2008. All the patients were evaluated preoperatively and postoperatively according to the physical findings, scores and radiographs, with a mean follow-up of 13.6 months (range 12~15 months). RESULTS: The apprehension test was positive in all the knees preoperatively and no knee was found to be positive at the follow-up. The grind test was positive in all the knees preoperatively and one knee was found to be positive at the follow-up. The Q-angle was 16.9degrees preoperatively and 18.3degrees at the follow-up. The Kujala score improved from 33.7 points to 94.1 points (p=0.018), the Lysholm score improved from 42.4 points to 92.6 points (p=0.018) and the Tegner activity level improved 2.1 to 5.1 (p=0.026). The congruence angle was 10.2degrees preoperatively and -3.4degrees at follow-up (p=0.018). The patellar height was 1.95 preoperatively and 1.6 at follow-up (p=0.028). There were no patients with recurrent dislocation. CONCLUSION: MPFL reconstruction using the autogenous hamstring tendon for recurrent patellar instability is an effective operation, according to the short term follow-up.