Medial surface of fibula

The medial surface of fibula is situated between the anterior and medial (or interosseous) borders. It is sometimes referred to as the anterior or the anteromedial surface. In the upper half of fibula, the medial (or interosseous) border closely aligns with the anterior border, to the extent that they may appear indistinguishable from each other. As a result, the medial surface becomes very narrow, measuring as little as 1 mm or even less.

The medial surface of fibula serves as the attachment sites for the three muscles of the extensor (or anterior) leg compartment. These include the slightly anteriorly positioned extensor digitorum longus and slightly posteriorly positioned extensor hallucis longus. The peroneus tertius muscle originates from the lower one-fourth of the medial surface of fibula.

Kindly note that in the old four-border four-surface naming system for the fibula, the medial refers to the area between the anteromedial and posteromedial borders of fibula. For more information, please consult the specifics regarding the body of the fibula.