Ankle Joint Replacement Outcomes Study

Count of participants without a failed ankle arthroplasty. Ankle arthroplasty will be considered as failed if the implant is revised or removed and the ankle fused.

AOFAS ankle evaluation form is a commonly used standardized assessment of foot and ankle function divided into three anatomic regions. The scale used for this study will be the Ankle-Hindfoot Scale that ranges from 0 to 100. A score of 100 points is the maximum for a patient presenting in excellent condition. The score decreases as pain, limited range of motion, daily activities, joint instability, and alignment are assessed.

FFI is a specialized questionnaire answered by the patient. The questionnaire consists of three parts used to report clinical scores for the domains of activity limitation, function, and disability in patients with foot and ankle conditions. Each item rated on a 0 - 10 Likert scale. 0 represents no pain/disability, and 10 represents the worst pain imaginable/severe disability for each item. Higher scores indicate decreased function.

FAAM is a region-specific subject questionnaire to evaluate activities of daily living and sports. Answers for both scales are based on a Likert scale (4-0) of:

4 - no difficulty 3 - slight difficulty 2 - moderate difficulty

1 - extreme difficulty 0 - unable to do Patients are asked to answer each question with a single response that most clearly describes their condition. Patients are asked to mark not applicable (N/A) if the activity in question is limited by something other than their foot or ankle. A higher score indicates a higher level of physical function.