Ankle
The region connecting the lower leg to the foot, centered on a joint that allows the foot to move relative to the leg.
Talus: A tarsal bone that articulates with the tibia and fibula to form the ankle joint. It transfers forces between the lower leg and foot at the ankle.
Talocrural joint: The synovial hinge joint between the tibia, fibula, and talus. It is the principal joint for moving the foot up and down relative to the leg.
Ankle sprain: An injury in which ankle ligaments are stretched or torn, commonly after the foot twists. It is a frequent injury to the structures that stabilize the ankle.
Knee: The joint between the thigh and lower leg, formed primarily by the femur, tibia, and patella. Unlike the ankle, it chiefly permits bending and straightening of the leg.
Tibia: The larger, medial bone of the lower leg, bearing most of its weight. Its lower end forms the inner side of the ankle joint.
Subtalar joint: The joint between the talus and calcaneus that contributes to foot inversion and eversion. It works below the ankle hinge to adapt the foot to sloping surfaces.
Ankle fracture: A break in one or more bones forming the ankle joint. Fractures can disrupt the joint’s load-bearing alignment.
Wrist: The joint region connecting the forearm to the hand, including the radiocarpal joint. It is the upper-limb counterpart often compared with the ankle, but has different bones and motion.
Fibula: The slender, lateral bone of the lower leg, which stabilizes the ankle and provides muscle attachment. Its lower end forms the outer ankle prominence and helps constrain the talus.
Dorsiflexion: Movement that brings the top of the foot toward the shin. It is one of the talocrural joint’s two main movements.