The subtalar joint (also known as talocalcaneal joint, latin: articulatio subtalaris) is an articulation formed by two bones in the foot - the talus and the calcaneus.
The articular surfaces of the subtalar joint are :
- concave posterior calcaneal facet on the posterior part of the inferior surface of the talus (latin: facies articularis calcanea posterior tali);
- convex posterior facet on the superior surface of the calcaneus (latin: facies articularis talaris posterior calcanei).
The bones that form the subtalar joint are connected by a fibrous capsule, the lateral and medial talocalcaneal ligaments, interosseous talocalcaneal and cervical ligaments.
The lateral talocalcaneal ligament passes obliquely downward from the lateral talar process to the lateral calcaneal surface.
The medial talocalcaneal ligament extends from the medial talar tubercle to the back of the sustentaculum tali and the medial surface of the calcaneus.
The interosseous talocalcaneal ligament passes obliquely downward from the sulcus tali to the calcaneal sulcus.
The cervical ligament extends from the superior calcaneal surface to the inferolateral tubercle of the talar neck.
The subtalar joint allows inversion (internal rotation) and eversion (external rotation) of the foot.