Ankle joint Flashcards
What type of synovial joint is the ankle
Hinge (one plane)
What movements does the ankle joint permit
Dorsiflexion and plantarflexion
What are the articulating surfaces at the ankle joint
Tibia and fibula produce a bracket shaped socket called a mortise
Body of talus fits into the mortise
Significance of articulating talus shape in terms of movement
Body of talus is wider anteriorly so during dorsiflexion, the talus gets wedged between the malleoli
This means dorsiflexion is more limited and more stable than plantarflexion
What are the groups of ankle ligaments
Collateral ligaments
Medial ligament (deltoid)
Lateral ligament
What are the collateral ligaments
Medial - from tibia to talus, from tibia to calcaneus
Lateral - from fibula to talus, room fibula to calcaneus
What is the medial ligament made up of
Anterior tibiotalar
Posterior tibiotalar
Tibial navicular
Tibial calcaneal
Where does the medial ligament originate
Medial malleolus
Where does the lateral ligament originate
Lateral malleolus
What is the lateral ligament made up of
Anterior talofibular
Posterior talofibular
Calcaneofibular
Where do plantar flexors pass at the ankle
Posterior to malleoli
Where do dorsiflexors pass at the ankle
Anterior to malleoli
Where do inverters insert
Medial aspect of foot
Where do everters insert
Lateral aspect of foot
Where is the joint capsule lax
Anterior and posterior
