Time frame: From the surgey to the end of follow-up (20 years of follow-up for each patient)
Foot and Ankle outcome score is used to evaluate the patient's functional abilities, symptoms, and quality of life related to ankle and foot conditions. The FAOS (Foot and Ankle Outcome Score) is a 42-item questionnaire comprising five subscales: pain (9 items), other symptoms (7 items), activities of daily living (ADL) (17 items), sports/recreation (5 items), and quality of life (4 items). Each question is rated on a 5-point Likert scale (none, mild, moderate, severe, and extreme problems) from 0 to 4. The score for each subscale is calculated by summing all the individual scores within the subscale and dividing the result by the maximum possible score for that subscale. The normalized score is then converted to a scale of 0 to 100, where 100 indicates no problems and 0 indicates severe problems. Measured at 6 months, 1 year, 2 years and every 2 years.