The true ankle joint consists of 3 bones: the tibia creates the medial (inner) section of the ankle; the fibula creates the lateral (outer) section of the ankle; and the talus creates the underside. The true ankle joint controls the dorsi-flexion and plantar flexion of the foot.
The subtalar joint is beneath the true ankle joint and is comprised of the talus on top and calcaneus on the bottom. The subtalar joint controls the side-to-side motion of the foot.
Medically speaking, the ankle is the marriage of the leg and the foot; it is only the articulation of the tibia, fibula, and the talus.
A fracture is a major or small break in a bone. Fractures of the ankle vary from minor avulsion injuries (tiny sections of bone that have chipped off) to serious obliteration breaks of the fibula, tibia or both.
Ankle fractures are frequent injuries that are usually caused by the ankle turning inward or outward. A lot of patients misdiagnose an ankle fracture for an ankle sprain, but they are very different and must have a correct and quick diagnosis. They sometimes occur at the same time.