Validity and reliability of Thai version of the Foot and Ankle Outcome Score in patients with arthritis of the foot and ankle

The Thai FAOS demonstrated sufficient levels of construct and content validity for the evaluation of foot and ankle arthritis. Although reliability was satisfactory for the major subscale ADL, it was not sufficient for the minor subscales. Our findings suggest that it can be used as a disease-specific instrument to evaluate foot and ankle arthritis and can complement other reliable outcome surveys.