Structures of the foot comprise a highly integrated group of 26 bones, with numerous muscles, tendons, and ligaments holding the bony structures together in proper alignment and providing support for balance and movement. The ankle is formed by the juncture of three bones – the lower ends of the tibia and fibula (the lower leg) and the uppermost bone of the foot, called the talus. The uniquely curved dome of the talus bone permits the hinge-like movement of the foot.