Identify the proximal and distal articular surfaces that compose the ankle (talocrural) joint. What is the joint classification?
What will be an ideal response?
ANS:
The talocrural joint includes the tibia and fibula proximally and the talus distally. The proximal articular surfaces are made up of the fibular malleolus, the distal tibia, and the tibial malleolus. The three facets together form what is known as the mortise, a three-sided surface equivalent to the working end of a wrench. The distal joint surfaces are the lateral facet of the body of the talus, the trochlea (superior surface) of the body of the talus, and the medial facet of the body of the talus. These three surfaces articulate with the lateral malleolus, distal tibia, and medial malleolus, respectively. The surface of the talocrural joint forms a congruent synovial hinge joint with one degree of freedom, although some small amounts of abduction-adduction and inversion-eversion of the talus within the mortise have been hypothesized.
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