Translation The study was approved by a local ethics committee (protocol #09-130). Following the guidelines for the cross cultural adaptation process written by the American Association of Orthopaedic Surgeons (AAOS) in 2000, the translation was performed using this six-step process 2: 1) Initial translation; 2) Synthesis; 3) Back translation; 4) Expert committee; 5) Test of the Pre-final version; and 6) Submission of document to the developer. For the "Initial translation", two independent translators whose mother tongue was French translated the scale from English to French. The second step of "Synthesis" required these two translators to meet, discuss and compose a synthesised version of the AOS. Two independent translators, blind to the original scale, whose mother tongue was English, translated the synthesised version back to English. An "Expert committee" composed of a linguist, two orthopaedic surgeons and the four translators revised the whole process and consolidated the pre-final version. The "Test of the Pre-final version" was performed using 60 subjects, with no ankle osteoarthritis, who answered the questionnaire and evaluated their comprehension of each item. From the data collected in this step, some sections of the test were changed to improve comprehension and readability. For the final step the investigators submitted the corrected version to Dr. Charles Saltzman, the developer of the English version, who approved its translation and use (Supplementary data 1).