ankle joint

Ligaments

deltoid ligament

· 2 layers

Deep part

· from medial malleolus

· to medial talus

· concavity below comma articular surface

Superficial part

· triangular (delta)

· from medial malleolus

· continuous insertion

· medial tubercle of talus

· edge of sustentaculum tali (strong)

· tuberosity of navicular

lateral ligament

· 3 parts

Anterior talofibular

· from anterior border of lateral malleolus

· forward to anterolateral neck of talus

Calcaneofibular

· from tip of lateral malleolus

· deep to peroneal tendons

· down and back to lateral calcaneus

Posterior talofibular

· from malleolar fossa

· horizontally back to lateral tubercle of talus

· above it lies the posterior tibiofibular ligament

inferior tibiofibular joint

· fibrous joint

Interosseous membrane

· connects interosseous borders of tibia and fibula

· fibres slope downwards from tibia to fibula

· resists downward movement of fibula on muscle contraction

· pierced by

· anterior tibial a

· perforating branch of peroneal a

Syndesmosis

· syn. interosseous ligament

· continuous with interosseous membrane

· strong fibres between adjacent surfaces of tibia and fibula

Anterior tibiofibular ligament

· lies on front of syndesmosis

Posterior tibiofibular ligament

· syn. inferior transverse ligament

· lies behind syndesmosis

· projects below margins of bones

· forms part of articulating surface for talus

· below it lies the posterior talofibular ligament