[Arthroscopic anatomical medical patellofemoral ligament reconstruction to treat recurrent patellar dislocation]

To investigate the procedure and efficacy of anatomical medial patellofemoral ligament (MPFL) reconstruction for the treatment of recurrent patellar dislocation assisted with arthroscopy.

Between January, 2010 and December 2012, 13 patients with recurrent patellar dislocation, who underwent anatomical MPFL reconstruction and the grafts of operation, were all adopted with autograft semitendinosus. The patellar side used the modified double bone tunnels and the minimally invasive percutaneous grafts through double patellar bone tunnels, and then fixed in the femoral tunnel with absorbable interference screw. Follow-up included the records of the subjective feeling, patellar apprehension test, recurrent dislocation, CT evaluation of bone tunnel position and patellar tilt angle. Knee function was evaluated by the Lysholm score and Kujala score.

Twelve patients were followed up for 36 months (range 24-60 months). All patients were satisfied with the treatment. No recurrent dislocation occurred. All the patients showed negative apprehension test. Two patients felt uncomfortable after excessive activity in the knee. Another 2 cases lost 10° flexion than the healthy knee. CT showed that the bone tunnel position were all well. The patellar tilt angle was decreased from 20.52°±1.48° preoperative to 13.52°±1.32° postoperative, with significant difference (t=14.88, P<0. 05); the Kujala score was improved from 55.2±4.51 preoperative to 93.8±3.87 postoperative, with significant difference (t=-36.238, P<0.05); and the Lysholm score was improved from 56.68±5.52 to 93.08±4.68, with significant difference (t=-33.382, P<0.05).

MPFL reconstruction assisted with arthroscopy is an effective surgical procedure for the treatment of recurrent patellar dislocation, which can improve the knee function with little trauma and complications.