ANKLE LIGAMENT FUNCTIONS

How many ligaments are on the lateral side of the ankle?

3 Anterior/posterior talofibular Calcaneofibular

How many ligaments is the deltoid ligament composed of?

4 - tibiocalcaneal - tibionavicular - anterior/posterior tibiotalar

Deep transverse MT ligament (MTP joint only)

Binds heads of MT's together and so limit their movement apart Limits flexion of MTP joint in isolation

CALCANEOCUBOID LIGAMENT: short plantar

Deep to long plantar ligament Passes from plantar surface of calcaneus to plantar surface of cuboid Limits DORSIFLEXION

TCN LIGAMENT: Spring ligament

Dense fibro-elastic Passes from sustentaculum tali of calcaneus to plantar surface of navicular Limits DORSIFLEXION and EVERSION

Plantar ligament

Dense fibrocart plate On plantar side of MTP and IP joints Limits EXTENSION

SUBTALAR LIGAMENT: lateral talocalcaneal ligament

Lateral

LATERAL LIGAMENT: posterior talofibular

Lateral malleolus to talus Limits INVERSION and dorsiflexion

LATERAL LIGAMENT: anterior talofibular

Lateral malleolus to talus Limits INVERSION and plantarflexion

LATERAL LIGAMENT: calcaneofibular

Lateral malleolus to the calcaneus Limits INVERSION Limits dorsiflexion

SUBTALAR LIGAMENT: deltoid ligament: medial talocalcaneal ligament

Medial

MEDIAL ANKLE JOINT: Tibiocalcaneal ligament

Medial malleolus of tibia to sustentaculum tali of calcaneous Limits eversion Relatively posterior: therefore limits dorsiflexion

MEDIAL ANKLE JOINT: Posterior tibiotalar

Medial malleolus to talus Limitis eversion Posterior- limits dorsiflexion

MEDIAL ANKLE JOINT: Anterior tibiotalar

Medial malleolus to talus Limits eversion Anterior- limits plantarflexion

MEDIAL ANKLE JOINT: Tibionavicular ligament

Medial malleoulus of tibia to the navicular Limits eversion Relatively anterior: therefore limits plantarflexion

Collateral ligaments of toes

On either side of MTP and IP joints Limit FLEXION (loose in extension)

CALCANEOCUBOID LIGAMENT: Long plantar

Passes from plantar surface of calcaneus to plantar surfaces of cuboid and bases of the lateral 4 MT's Strengthens plantar aspect of joint

CALCANEOCUBOID LIGAMENT: Bifurcate (lateral part)

Passes from upper anterior end of calcaneus to medial surface of cuboid Limits PLANTARFLEXION

TCN LIGAMENT:Bicurfate ligament (medial part)

Passes from upper end of calcaneus to lateral surface of navicular Limits PLANTARFLEXION and INVERSION

SUBTALAR LIGAMENT: Interosseous talocalcaneal ligament

Posterior and anterior bands Located in sinus tarsi (tarsal canal) Acts as fulcrum for inversion/eversion

What is the general function of the medial (DELTOID) ligaments?

Prevent EVERSION Anterior parts limit plantarflexion Posterior parts limit dorsiflexion

SUBTALAR LIGAMENT: posterior talocalcanean ligament

Talus to calcaneus from posterior surface of talus