Subtalar joint
/dʒɔɪnt/
1. [noun] the subtalar joint is an articulation between two of the tarsal bones in the foot – the talus and calcaneus. The joint is classed structurally as a synovial joint, and functionally as a plane synovial joint. This article will look at the anatomy of the subtalar joint – its articulating surfaces, movements and neurovascular supply. The subtalar joint is an articulation between two of the tarsal bones in the foot – the talus and calcaneus. The joint is classed structurally as a synovial joint, and functionally as a plane synovial joint. This article will look at the anatomy of the subtalar joint – its articulating surfaces, movements and neurovascular supply. The subtalar joint is enclosed by a joint capsule , which is lined internally by synovial membrane and strengthened externally by a fibrous layer. The capsule is also supported by three ligaments: Posterior talocalcaneal ligament Medial talocalcaneal ligament Lateral talocalcaneal ligament An additional ligament – the interosseous talocalcaneal ligament – acts to bind the talus and calcaneus together. It lies within the sinus tarsi (a small cavity between the talus and calcaneus), and is particularly strong; providing the majority of the ligamentous stability to the joint
Source: https://teachmeanatomy.info/lower-limb/joints/subtalar/
Frequently Asked Questions
How does the subtalar joint contribute to everyday foot balance during activities like walking on uneven ground?
The subtalar joint, located between the talus and calcaneus, allows the foot to invert and evert. This motion helps the foot adjust to uneven terrain, distributing weight properly and providing the balance needed for smooth movement.
How is the stability of the subtalar joint achieved through its supporting ligaments?
The stability comes from a group of ligaments, including the posterior, medial, lateral talocalcaneal and the especially strong interosseous talocalcaneal ligament in the sinus tarsi. These reinforce the connection between the talus and calcaneus while permitting controlled motion.
What does the term 'subtalar' reveal about the joint's position in the foot?
The prefix 'sub-' means 'below' and 'talar' refers to the talus bone, indicating that the joint sits beneath the talus. This etymology aids in remembering its location and relation to other structures in the foot.