Functional and clinical outcome of anterior cruciate ligament reconstruction with peroneus longus autograft and correlation with MRI after 3 years

Introduction: Autograft options for anterior cruciate ligament reconstruction over the years have gone from bone -patellar tendon-bone to hamstring to peroneus longus tendon. Considering the drawbacks of other autografts, we analyse peroneus longus autograft holistically as a viable alternative. Materials and methods: This was a prospective study of 113 patients undergoing anterior cruciate ligament reconstruction with peroneus longus autograft between January 2017 and November 2018 for isolated, full -thickness ACL tears. Functional analysis was done using the Tegner-Lysholm score pre-operatively, at 6 months, 1 year, 2 years, and 3 years postoperatively. At terminal follow-up, stability was checked clinically by Lachman test, residual morbidity of donor site was assessed using foot and ankle disability index, and radio-graphic correlation was done with magnetic resonance imaging. Results: The mean diameter of the graft after tripling was 9 +/- 0.71 mm and the average length before tripling was found to be 27.07 +/- 2.76 cms. At terminal follow-up, 101 patients showed excellent, while 12 patients showed good outcomes. The mean foot and ankle disability index was 94.8 +/- 3. 90.27% of patients had no laxity on clinical examination, and magnetic resonance imaging of all the patients at terminal follow-up showed good graft uptake. Conclusions: Peroneus longus autograft shows intraoperative consistency and gives excellent functional outcome, clinical stability, and no donor site morbidity even three years postoperatively.