Fibula (English)

The head forms the enlarged proximal end of the fibula. It bears two main landmarks: an apex (a.k.a., styloid process) which projects proximally from its posterior surface, and a small, medially oriented articular surface for the lateral condyle of the tibia, which contributes to the superior tibiofibular joint. The body of the fibula forms a long thin shaft, with three surfaces (medial, lateral and posterior) separated by three ill-defined borders (anterior, posterior and medial). The medial surface of the fibula is marked by an interosseous crest, which is connected to the interosseous border of the tibia via the interosseous membrane of the leg to form the middle tibiofibular joint. The distal end of the fibula articulates once again with the tibia to form the inferior tibiofibular joint, before expanding to form the lateral malleolus which constitutes the lateral ‘knob’ of the ankle. Like its medial counterpart, the lateral malleolus articulates with the body of the talus to collectively form the talocrural joint.