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The ankle joint is a hinged synovial joint the is developed by the coupling of the talus, tibia, and also fibula bones. Together, the three boundaries (listed below) type the fishing eye mortise.

You are watching: The movements known as dorsiflexion and plantar flexion involve moving the

The articular facet of the lateral malleolus (bony importance on the lower fibula) develops the lateral border that the fishing eye jointThe articular side of the medial malleolus (bony importance on the reduced tibia) creates the medial border of the jointThe superior section of the fishing eye joint creates from the worse articular surface of the tibia and the premium margin that the talus.

The talus articulates inferiorly v the calcaneus and anteriorly v the navicular.

The top surface, referred to as the trochlear surface, is somewhat cylindrical and allows for dorsiflexion and also plantarflexion the the ankle.The talus is broader anteriorly and an ext narrow posteriorly.


This 7 minute video clip is a an excellent summary the the ankle.


Structure and also Function

The activities that occur at the fishing eye joint room plantarflexion, dorsiflexion, inversion, and also eversion.

Articulating Surfaces

Trochlea that TalusMalleolar Mortis formed by Tibia & FibulaLateral & Medial Malleolus

Joint Capsule


The articular capsule surrounds the joints, and also is attached, above, to the borders of the articular surfaces of the tibia and malleoli; and below, come the talus approximately its upper articular surface. The joint capsule anteriorly is a broad, thin, fibrous layer. Posteriorly, the fibres space thin and run mainly transversely, blending with the transverse ligament. Laterally the capsule is thickened and also attaches to the hollow on the medial surface of the lateral malleolus. The synovial membrane expand superiorly in between Tibia & Fibula as much as the Interosseous Tibiofibular Ligament.<3>


The key stabilizing ligaments


The anterior and posterior tibiotalar ligaments affix the tibia come the talus.The last 2 ligaments that the triangle space the tibionavicular ligament i beg your pardon attaches come the navicular anteriorly and the tibiocalcaneal ligament i beg your pardon attaches come the calcaneus inferiorly

2. Laterally the ankle has stabilization native three separate ligaments, the anterior and posterior talofibular ligaments, and the calcaneofibular ligament. <1>


The anterior talofibular ligament connect the talus come the fibula, the weakest the the three lateral ligaments and also thus the most generally injured.The posterior talofibular ligament affix the talus to the fibulaThe calcaneofibular ligament connect the fibula come the calcaneus inferiorly.

The lateral ligaments stabilize the ankle, and also serve as a overview to direct ankle motion by attaching the lateral malleolus to the bones listed below the fishing eye joint. They room responsible because that resistance versus inversion and internal rotation stress. <3>

See table listed below for full description of ligamants.



Anterior Talofibular Ligament (ATFL)

Flat Weak Band the extends Anteriomedially.

Most typically damaged ligament of the ankle.

Lateral MalleolusNeck of Talus

Restrain anterior displacement of the talus in respect to the fibula and also tibia.

Resists turning back in planterflexion.

Posterior Talofibular Ligament


Thick, reasonably strong band that runs horizontally medially.

This ligament is under higher strain in full dorsiflexion of ankle.

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Rarely injured because bony stability protects ligaments once ankle in dorsiflexion.

Malleolar Fossa that FibulaLateral Tubercle the Talus

Forms the back wall surface of the recipient socket for the talus" trochlea.

Resists posterior displacement of the talus.

Calcaneofibular Ligament (CFL)

Round cord that passes posterioinferiorlyTip that Lateral MalleolusLateral surface ar of Calcaneus

Aids Talofibular stability during Dorsiflexion.

Restrain reverse of the calcaneus v respect to the fibula.

Prevent Talar tilt into Inversion.



Anterior Tibiotalar


Medial Malleolus Head of Talus

Reinforces ankle Joint.

Control Plantarflexion & Eversion

Posterior Tibiotalar


Talus PosteriorlyControl Dorsiflexion



Forms most anterior part of the Deltoid Ligament

Dorsomedial element of NavicularReinforces fish eye Joint



Very slim ligamentSustentaculum TaliReinforces fish eye Joint


The muscles of the leg divide into anterior, posterior, and also lateral compartments.