The fibula (also known as the calf bone) is the smaller leg bone located on the lateral side next to the tibia.

As a long bone, the fibula also has the following parts similarly to other long bones: a diaphysis (or shaft), two epiphyses (proximal and distal), and two metaphyses (between the diaphysis and each epiphysis).

The proximal epiphysis of the fibula features the head of the fibula, which has an articular surface that is facing the tibia.

The fibular diaphysis has three margins (anterior, posterior, interosseous) that separate three surfaces (lateral, medial, and posterior).

The distal epiphysis of the fibula features the lateral malleolus - a prominence on the outer side of the ankle. It presents the malleolar articular surface, facing the talus, and the lateral malleolar fossa (or lateral fossa of malleolus) - for the attachment of the posterior talofibular ligament.

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Fibula