Arthroscopic treatment of lateral ankle instability is a recent innovation. In 2014, a prospective study was initiated by the French Society of Arthroscopy demonstrating the feasibility, morbidity and short-term results of arthroscopic treatment of ankle instability.

The functional results of arthroscopic treatment of chronic ankle instability found after one year were maintained in the medium term.

The prospective follow-up of the patients included in the initial cohort was continued. The Karlsson and AOFAS scores, as well as patient satisfaction, were assessed. The causes of failure underwent univariate and multivariate analyzes. The results of 172 patients were included (40.2% ligament repairs; 59.7% ligament reconstructions). The average follow-up was 5years. The average satisfaction was 8.6/10, the average Karlsson score was 85 points and the average AOFAS score was 87.5 points. The reoperation rate was 6.4% of patients. The failures were related to an absence of sports practice, a high BMI and female gender. A high BMI and the intense sports practice were associated to ligament repair failure. The absence of sports practice and the intraoperative presence of the anterior talofibular ligament were associated to ligament reconstruction failure.

Arthroscopic treatment of ankle instability confers high satisfaction in the medium term, as well as long-lasting results with a low reoperation rate. A more detailed evaluation of the failure criteria could help guide the choice of treatment between ligament reconstruction or repair.

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