Representative magnetic resonance image for measuring morphological variables of the foot. The lengths of the forefoot bones of the big (included the distal phalanx, proximal phalanx, and metatarsal) and second (included the distal phalanx, middle phalanx, proximal phalanx, and metatarsal) toes were measured along the long axis of the bone between the intersections of the long axis and the cortex at the distal and proximal ends and then totaled to assess overall forefoot bone length for each toe. The lengths and heights of the talus and calcaneus were measured as maximal distances between the cortexes at the distal and proximal ends. The foot arch height was measured as the minimum vertical distance between the navicular and the line connecting the thenar eminence to the bottom of the heel.