Actions Of The Ankle

The ankle (talocrural) joint consists of articulations between the tibia and talus (tibiotalar joint) and the fibula and talus (talofibular joint) and allows for motion primarily in the saittal plane, as (Figure 37-1B) follows:

Plantar flexion (flexion). Movement in which the angle between the leg and foot increases.

Dorsiflexion (extension). Movement in which the angle between the leg and foot decreases.

The subtalar joint is formed by articulations between the talus and the calcaneus and allows for motion primarily in the coronal plane, as follows:

Inversion (prontation). Movement in which the plantar surface of the foot faces medially.

Eversion (supination). Movement in which the plantar surface of the foot faces laterally.

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