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The subtalar joint 

The subtalar joint
The subtalar joint

Bryan English

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date: 02 March 2021

The inferior aspect of the talus and superior aspect of the calcaneum form the subtalar joint. Normally, the surface consists of three facets and an accessory joint along the mid sulcus of the calcaneum. A small proportion of people, however, have only two facets (the anterior facets being combined). The three-facet joint in supination forms an osseous block. One hypothesis is that the two-facet joint has a greater surface area, allowing more movement, as the axis of the joint will move towards the transverse plane and away from the coronal plane. It follows that people who pronate excessively may have a higher incidence of only one anterior facet. Anterior to the posterior facet is the sinus tarsi (acting like an accessory joint). Two thickenings of the capsule of the joint at this site form the anterior and posterior interosseous ligaments, which provide the majority of support for the subtalar joint.

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