Kinesiology 3336A/B Lecture Notes - Lecture 13: Tendinopathy, Subacromial Bursa, Rotator Cuff

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

Document Summary

Consists of the humerus, scapula (glenohumeral joint) articulation through the a/c and s/c joints. All must work together with musculature to maintain the instantaneous center of. Motion (icom) of the gh joint: bony structures keep articulation in contact, rc muscles muscles- compress and centralize humeral head, scapular stabilizers help position for max stability. Pathology- disruption of 1/more components of the complex= altered icom. Labrum deepens the socket (egg cup: if turned sideways- not stable. With movement it is like a ball balancing on a seal"s nose. Deltoid- may have negative effect (don"t need to know list) Remember the seal with the ball on its nose. Setting phase: initial 30 degrees the scapula doesn"t move as it establishes a stable base. 2:1 ratio between the humerus and scapula: scapula has to move underneath to move humeral head. <90 degree spine of scapula: upper trapezius, serratus anterior. >90 ac joint: upper & lower trapezius, seratus anterior.