Describe the three articular surfaces of the subtalar joint, including the capsular arrangement

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ANS:
The subtalar joint is composed of three different facets: a large posterior facet and two smaller medial and anterior facets. The posterior facet is convex on the calcaneus and concave on the talus. It is encompassed by its own capsule. The anterior and medial facets are concave on the calcaneus and convex on the talus. These two facets share a joint capsule with the talonavicular joint. The posterior joint capsule and the more anteriorly located facets are also separated by sulci on both the calcaneus and talus. When brought together, these sulci create the tarsal canal, which runs transversely through the hindfoot.