subtalar joint :-
the talocalcaneal or subtalar joint formed by the there separate plane articulation between the talus anteriorly and calcarenous inferiorly
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subtalar joint structure :-
there are three articulation between the talus and calcaneus
1) posterior articulation
2) anterior articulation
3) medial articulation
-the posterior articulation is formed by the concave facet on the under surface of the body of the talus and convex facet on the body and neck of talus and concave facet on the calcaneous.
- carpal tunnel between posterior articulation:_ and the anterior and medial articulation there is bony tunnel formed by a surface in the inferior talus and superior calcaneous ,it turns obliquely across the foot its large end ( sinus tarsi ) lies just anterior to fibular malleolus and its small end lie below tibial malleolus, and above a bony out cropping on the calcaneus
- the tarsal canal and ligament divide the posterior articulation and the anterior + medial articulation of the subtalar joint into seperate non communicating joint cavities
-the posterior articulation has its own capsule and anterior and medial articulation share a capsule with the the talonavicular joint.
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