Ligaments of the ankle and foot
Spring/plantar calcaneonavicular ligament
Attachments = Ant margin sustentaculum tali (calcaneus) ---> plantar surface navicular Function = Supports the head of the talus - very elastic; hence spring Sustains medial longitudinal arch
Short plantar ligament (plantar calcaneocuboid)
Attachments = Calcaneus (ant tubercle) ---> plantar surface cuboid Function = Short, wide, strong Resists depression of lateral longitudinal arch
Plantar aponeurosis
Attachments = Calcaneus (med process of tuberosity) ---> longitudinal bands to each toe Function = Supports longitudinal arch
Lateral collateral ligament (of ankle)
Attachments = Consists of 3 separate ligaments: -Anterior talofibular: ant. Border + tip of lateral malleolus ---> neck of talus -Calcaneofibular: tip of lateral malleolus ---> middle of lat surface of calcaneus Posterior talofibular: malleolar fossa of lat malleolus ---> upper surface of post process of talus Function = Strained during plantarflexion + inversion
MCL/Deltoid Ligament
Attachments = Fan-shaped ligament extending from the borders of the tibial malleolus and contains Anterior tibiotalar, Posterior tibiotalar, Tibiocalcaneal, Tibionavicular Function = Extremely strong, forces that would open the medial aspect ofthe ankle joint tend to result in avulsion factors of the tibial malleolus, rather than tearing of the deltoid ligament
Interosseus talocalcaneal ligament
Attachments = Located in sinus tarsi Function = Firmly joints the talus + calcaneus
Long plantar ligament
Attachments = Plantar surface calcaneus ---> cuboid (deep fibers) + bases MTs 2-4 (5) (superficial fibers). Function = Supports calcaneocuboid joint Strongest ligament in resisting depression of lateral longitudinal arch
Bifurcate ligament
Attachments = Spans the distance between the calcaneus and the cuboid/navicular (2 portions) Function = Resists movement between the calcaneus, cuboid and navicular.