Abstract: Objective:To observe the process and curative effect of12 cases of recurrent patellar dislocation treated by double bundle medial patellofemoral ligament (MPFL) reconstruction with anterior half peroneus longus and lateral retinacular release, and to investigate the etiology and treatment method of recurrent patellar dislocation. Methods:A total of 12 patients with recurrent patellar dislocation were enrolled in this study, the MPFL was reconstructed with the anterior half peroneus longus, patellar fixation with suture anchors was completed with 2 parallel 5.0 mm anchors which were spaced 1.0 cm apart at the anatomic insertion site of the native MPFL,the femoral side was secured with a interference screw, and the lateral retinaculum was released at the same time.The Lysholm score,IKDC score,congruence angle,J sign,grind test,and apprehension test of the patients before and after operation were detected. Results:The mean follow-up period was 16.4 months,and the Lysholm score of the patients before operation was lower than the last follow-up(t=9.03, P < 0.001); the IKDC score of the patients before operation was lower than the last follow-up (t=9.75, P < 0.001); the congruence angle of the patients before operation was larger than after operation (t=7.22,P < 0.001). All of the patients demonstrated the positive results before operation in Jsign,grind test,and apprehension test, and the negative results in J sign,grind test,and apprehension test after operation. No patient appeared pateela fracture and recurrence of patellar dislocation during the follow-up period. Conclusion:The curative effect of reconstruction of the MPFL with anterior half peroneus longus combined with lateral retinacular release is well in the treatment of recurrent patellar dislocation, which is suitable for clinical promotion.

Key words: recurrent patellar dislocation, medial patellofemoral ligament, lateral retinacular release