A short-term follow-up study after reconstruction of medial patellofemoral ligament(MPFL) combined with adductor magnus tendon autograft for the treatment of recurrent dislocation of patella(RDP)

Abstract

Objective To explore the technique and efficacy of the arthroscopic reconstruction of medial patellofemoral ligament (MPFL) combined with adductor magnus tendon autograft in treatment of recurrent dislocation of patella(RDP) in children.Methods Six cases of RDP were treated using arthroscopic reconstruction of MPFL combined with adductor magnus tendon autogmft beween Jan 2007to Jul 2010.The condition of patellofemoral joint and MPFL were detected with X-ray,CT and MRI preoperatively.The arthroscopic exanination was conducted before reconstruction to observe pateltofemoral congruence and patellar track,as well as articular cartilage.The MPFL was reconstructed followed by adductor magnus tendon autograft.Then arthroscopic examination was taken again for measurement of patellofemoral congruence and patellar track after surgery.Function training of knee joint was applied and subjective symptoms were further scored postoperatively.Results No infection,graft rejection and rupture were seen in all cases.Patients were followed up for 12-36 months (Average 18 months).Lysholm scores showed an improvement from 76.7 ± 8.7 in pre-surgery to 95.6 ± 5.7 ( P =0.000) in post-surgery.X-ray detection indicated excellent patella reduction without recurrence of dislocation or subluxaion.Conclusions The reconstruction of medial patellofemoral ligament (MPFL) combined with adductor magnus tendon autograft,is effective approach to treat RDP. Key words: Patellar dislocation; Patellar ligament; Arthroscopy