Ball and socket ankle joint:
Rare. Trochlea surface of talus is hemispherical – permits inversion and eversion of ankle joint as well as dorsiflexion and plantarflexion. Usually asymptomatic.
A variation of the true ‘ball and socket’ ankle joint may occur due to large individual variations in ankle joint axis position in those who adapt to a limited range of motion at the subtalar joint.
https://www.ncbi.nlm.nih.gov/pubmed/28633775?dopt=Abstract
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