The talus (also ankle bone, latin: os talus) is an irregularly shaped bone which links the foot and the leg through the ankle joint.
The talus has three parts:
- body of talus,
- neck of talus,
- head of talus.
The body of the talus features several landmarks and articulating surfaces, such as:
- trochlea of talus, with
- medial malleolar surface,
- lateral malleolar surface,
- superior articular surface of talus,
- inferior articular surfaces,
- sulcus tali,
- tarsal sinus (formed together with the calcaneus).
The trochlea of the talus is the larger and posterior part of the body of the talus, which has a semi-cylindrical form and articulates with tibia and fibula. There are three surfaces presenting on the trochlea of the talus: the medial and lateral malleolar surfaces, and the superior articular surface of the talus.
The medial malleolar surface is an almost sagittally oriented surface of the talus that articulates with the medial malleolus (tibia).
The lateral malleolar surface is a surface on the lateral side of the talus articulating with the lateral malleolus (fibula).
The superior articular surface of the talus articulates with the inferior articular surface of the tibia.
The inferior articular surfaces (anterior, middle, posterior) are three articular surfaces on the inferior side of the talus for the attachment of joints connecting the talus with the calcaneus bone.
The sulcus tali is a groove on the inferior surface of the talus between the posterior and the middle articular surfaces.
The tarsal sinus is an indentation formed by the sulcus tali and the calcaneal sulcus.
The neck of the talus is the narrow part proximal to the head of the talus.
The head of the talus is a spherical part of the talus directed anteriorly and medially, and it has an articulating surface for articulation with the navicular bone.