Subtalar joint
From Wikipedia, the free encyclopedia
| Subtalar joint | |
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| Subtalar Joint | |
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| Ligaments of the medial aspect of the foot. | |
| Latin | articulatio subtalaris, articulatio talocalcanea |
| Gray's | subject #96 352 |
| MeSH | Subtalar+Joint |
| Dorlands/Elsevier | a_64/12161574 |
- For a review of anatomical terms, see Anatomical position and Anatomical terms of location.
In human anatomy, the subtalar joint, also known as the talocalcaneal joint, is a joint of the foot. It occurs at the meeting point of the talus and the calcaneus.
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[edit] Motion
The joint allows inversion and eversion of the foot, but plays no role in dorsiflexion or plantarflexion of the foot.[1]
It is considered a plane synovial joint [2], also commonly referred to as uniaxial hinge joint.
[edit] Relation of bones
The talus is oriented slightly obliquely on the anterior surface of the calcaneus.
There are two points of articulation between the two bones: one anteriorly and one posteriorly:
- At the anterior talocalcaneal articulation, a convex area of the talus fits on a concave surface of the calcaneus.
- The posterior talocalcaneal articulation is formed by a concave surface of the talus and a convex surface of the calcaneus.
The subtalar joint contributes to 10% of dorsiflexion of the ankle.
[edit] Ligaments and membranes
The main ligament of the joint is the interosseous talocalcaneal ligament, a thick, strong band of two partially joined fibers that bind the talus and calcaneus. It runs through the sinus tarsi, a canal between the articulations of the two bones.
There are four additional ligaments that form weaker connections between the talus and calcaneus.
- The anterior talocalcaneal ligament (or anterior interosseous ligament) attaches at the neck of the talus on the front and lateral surfaces to the superior calcaneus.
- The short band of the posterior talocalcaneal ligament extends from the lateral tubercle of the talus to the upper medial calcaneus.
- The short, strong lateral talocalcaneal ligament connects from the lateral talus under the fibular facet to the lateral calcaneus, and runs parallel to the calcaneofibular ligament.
- The medial talocalcaneal ligament extends from the medial tubercle of the talus to the sustentaculum tali on the medial surface of the calcaneus.
A synovial membrane lines the capsule of the joint, and the joint is wrapped in a capsule of short fibers that are continuous with the talocalconeonavicular and calcaneocuboid joints of the foot.
[edit] Sources
- ^ Kyung Won, PhD. Chung (2005). Gross Anatomy (Board Review). Hagerstwon, MD: Lippincott Williams & Wilkins, 123. ISBN 0-7817-5309-0.
- ^ Moore and Agur. Essential Clinical Anatomy. Lippincott Williams and Wilkins. 2007. ISBN 978-0-7817-6274-8
- Calais-Germain, Blandine. "Anatomy of Movement", Eastland Press, 1993. ISBN 0-939616-17-3
- Anatomy of the Human Body, Henry Gray, 1918
[edit] Additional images
 Skeleton of foot. Medial aspect. |
 Skeleton of foot. Lateral aspect. |
 Coronal section through right talocrural and talocalcaneal joints. |
 Talocalcaneal and talocalcaneonavicular articulations exposed from above by removing the talus. |
[edit] External links
- Duke Orthopedics sub_talar_joint
- ORT56 at FPnotebook
- Subtalar+joint at eMedicine Dictionary
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