Evaluation of psychometric properties In order to validate the use of the French AOS version, the investigators set out to evaluate the psychometric properties of the test on ankle osteoarthritis patients using the same process as the original study validating the English version of the AOS 6. Patients with isolated ankle degenerative changes at the orthopaedic outpatient clinic of the Centre Hospitalier Universitaire de Sherbrooke (CHUS) were included. To be included, patients had to consider French as their mother tongue and be able to read and write in French. Patients under 18 years old and those with additional foot and/or ankle pathologies were excluded.