KNES 377 Lecture 10: Ch. 22 Foot, Ankle, and Leg
6 Nov 2016
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Document Summary
Very complex: composed of many bones, made to be weight bearing with ambulation, agile to allow us to cut, spin, tiptoe, very functional. Major joints: distal tibiofibular joint: interacts with ankle mortise (comprises ankle dome); will spread into dorsiflexion, talocrural joint: ankle joint; where talus articulates with mortis. Plantarflexion/dorsiflexion occur here: subtalar joint: underneath the talus; articulation of talus and calcaneus. Inversion and eversion occur here: midfoot: tarsal bones; flexible. Allows foot to conform to whatever we are stepping on. Supports arches: mtp: knuckles of the toes. 1st mtp joint is most important in gait (need 60 degrees for normal function). Anatomical zones: rearfoot: stability at initial contact and creates lever arm for plantar flexion during gait, midfoot: shock absorbers that allow foot to conform, forefoot: serve as a lever in the swing phase of gait. Deltoid ligament: composed of 4 ligaments that check against eversion: lateral talocrural: anterior talofibular, calcaneofibular, posterior talofibular.
