EDKP 330 Study Guide - Mechanical Advantage, Osteotomy, Spasticity
23 Feb 2013
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Head of humerus sits in pocket called acetabulum . Innominate (one half: ilium, ishcium pubis. Proximal femur: head is 2/3 sphere (vs humerus which is 1/3 sphere) Thickest in middle, thinner on outer edges. Completely covers head except for posterior portion to allow for ligament attachement. 2 halves (innominate sides) together = boney pelvis. Large/strong: some cross hip joint and lumbar spine, some cross hip joint and knee. Hip abductors: gluteus medius & minimus. Help keep pelvis level resist grf. Labrum: fibrocartilaginous ring, function: deepens acetabulum. Increased articulation b/w head of humerus and acetabulum more support throughout rom: tear is hard to diagnose. Iliofemoral, pubofemoral, ischiofemoral: restict movement to make sure hip is stabilized, very strong, reinforce hip joint anteriorly. Humerus: 1/3 sphere vs femur: 2/3 sphere: more support by ligament/capsule. Due to fibrous attachement: 3 degrees of freedom triaxial joint. Movement limitations are caused by: ligaments, muscles, combination.
