Subtalar Joint Flashcards
Joint classification, how the joint achieve stability, movements and muscles, innervation and blood supply, what can go wrong and how to tell on examination.
Classify the subtalar joint in terms of structure and function.
Structure - synovial; function - plane joint.
What are the articulating surfaces of the subtalar joint?
Posterior surface of talus and superior surface of calcaneus.
What are the ligaments that allow stability of the subtalar joint?
Posterior, medial, lateral, and interosseous talocalcaneal ligaments.
What are the movements of the subtalar joint?
Eversion and inversion.
Which muscles power eversion of the subtalar joint?
Fibularis longus, fibularis brevis.
Which muscles power inversion of the subtalar joint?
Tibialis anterior.
Which arteries supply the subtalar joint?
Posteriorly the tibial artery, fibular artery.
Which nerves innervate the subtalar joint?
Medial and lateral plantar nerves, deep fibular nerve to dorsal aspect.
What is the mechanism of injury of a calcaneal fracture?
Crush injury, fall onto heel from a height so talus is driven into calcaneus.
What is the complication of calcaneal fractures?
Subtalar joint is disrupted so future arthritis.
