Kinesiology 2236A/B Study Guide - Final Guide: Humerus, Lower Extremity Of Femur, Supraspinatus Muscle
6 Apr 2017
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Clinician is doing the work not the patient. If foot is planted = femur rotates medially. If femur is fixed = tibia rotates laterally. Rotation occurs during last few degrees of extension because the medial femoral condyle is larger than lateral. The popliteus then must contract to externally rotate the femur on the tibia to unlock the knee. Same displacement so it is lined up correctly because of the large medial condyle on the femur. Pronation is like the 3 bears (need goldilocks just right) Pronation = impact absorption phase of gait: we either pronate too much, not enough (supination) or just right, over-pronation causes femur to turn in even more because of the screw-home mechanism. Pronation is a mobile adaptor, good unless it is too much and excessive. Re-supinate and arch comes up, makes it more stable and locks it together for take-off.
