Kinesiology 3336A/B Lecture Notes - Lecture 7: Weight-Bearing, Hemarthrosis, Lateral Condyle Of Femur

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 3336A/B
• Professor: Dave Humphreys

Document Summary

Contains 3 bones and 3 articulating surfaces: between the medial and lateral condyles of the femur and tibia (tibiofemoral joint, and between the patella and femur (patellofemoral joint) Knee can move through flexion, extension and rotation. Knee flexion-extension takes place between the bottom of the femur and the top of the menisci. Twisting motion takes place between the bottom of the menisci and the tibia. Rotation occurs during the last few degrees of extension because the medial femoral condyle is larger than lateral. If femur fixed, tibia rotates laterally: same movements, just depends in wb or nwb. This locks the joint to increase stability. The popliteus then must contract to externally rotate the femur on the tibia to unlock the knee. Knees have relatively poor bony fit when flexed. Knee has a strong fibrous joint capsule more stability: thickenings on capsule ligaments. Need to rely on other structures: mcl, lcl, acl, pcl, dynamic stabilizers hamstrings, quads, it band, gastrocs.