Methods: A total of 36 patients with unilateral transtibial amputations and 36 age and body mass index (BMI)-matched male controls will be participated in this cross-sectional study. Functional performance will be assessed by 6-minute walking distance (in meter). The Foot and Ankle Outcome Score (FAOS) will be used for the assessment of the symptoms and the functional limitations of the foot and ankle. The health-related quality of life of the subjects will be evaluated with Short Form-36 (SF-36). Subjects' talar cartilage, tibialis anterior and gastrocnemius muscle thickness measurements will be performed using musculoskeletal ultrasound.

