The talocalcaneonavicular articulation is a ball and socket joint: the rounded head of the talus

Talus bone

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 being received into the concavity formed by the posterior surface of the navicular, the anterior articular surface of the calcaneus, and the upper surface of the plantar calcaneonavicular ligament

Plantar calcaneonavicular ligament

The plantar calcaneonavicular ligament is a ligament on the underside of the foot that connects the calcaneus with the navicular bone.-Structure:...

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There are two ligaments in this joint: the articular capsule and the dorsal talonavicular.