The ankle is a hinge-type, freely moving synovial joint between the foot and leg. The ankle contains seven tarsal bones that articulate (connect) with each other, with the metatarsal bones of the foot.

Injuries to the ankle are usually by external forces with the foot being twisted externally, inverted, everted or internally twisted on the tibia.

There ate several degrees of classifications of ankle fractures.

a. Fracture of one malleolus with stable ankle mortice.
b. Bimalleolar fracture with or without ligament tear leading to ankle instability.
c. Trimalleolar fracture with instability.
d. Supra-syndesmotic fracture of the fibula.
e. Vertical impaction fracture of the distal articular surface of the tibia.

The treatment is to restore the position of the talus within the ankle mortice. To ensure the joint is parallel to the ground and there is stability.

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