At the first visit, socio-demographic data (age, sex, BMI, occupation) and pertinent past medical history (Diabetes, neuropathy, ankle or foot fractures)) were collected and patients were asked to perform single heel lift tests of both affected and unaffected side. The participants completed three questionnaires: AOS-French version, SF-36, and WOMAC. Criterion validity was assessed by comparing the AOS to the WOMAC and the SF-36 scores. Construct validity was established by the examination of the correlation between the AOS scores and the single heel lift test. Finally, to measure test-retest reliability, the patient was asked to complete the AOS a second time and a small questionnaire detailing any modification to the treatment (shoes, orthotics, medication, surgery, injection) one week following the first visit and return it by mail. Any modification to their treatment between the completion of the two AOS questionnaires would nullify the test-retest reliability, so these patients would be excluded in the analysis.