KINESIOL 2E03 Lecture Notes - Lecture 2: Hyaline Cartilage, Malleolus, Synovial Membrane
21 Sep 2016
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Document Summary
Articular cartilage smooth, reduces friction, spongy for shock absorption. Joint/articular capsule primarily collagen; holds joints together but doesn"t resist any movement: line with synovial membrane which creates fluid to reduce friction (overproduction of fluid due to injury swelling) Eversion: structures on lateral side come closer together, medial side opens up. Inversion: lateral side opens up, medial side comes closer together. Lateral and medial malleolus squeeze trochlea to allow it to work as a hinge. Most of the weight bearing of leg comes up through tibia. Space where trochlea of talus fits in is called the mortise. Little bit of translation occurs as well couple mm at most. Talus shifts backwards into mortise (posteriorly) during dorsiflexion. Weight bearing tib/fib move not talus so they move anteriorly. Dorsiflexion: lat/medial malleolus open up a bit to allow for wide part of trochlea to go back. Plantar flexion: lat/medial malleolus move closer together to squeeze narrow back part of trochlea.
