Kinesiology 2236A/B Lecture Notes - Lecture 11: Acromioclavicular Joint, Glenohumeral Ligaments, Shoulder Joint

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2236A/B
• Professor: Dave Humphreys

Document Summary

The upper extremity: upper extremity articulation with the thorax aka shoulder, full of complex joints, sternoclavicular (sc, acromioclavicular (ac, scapulothoracic, glenohumeral. Background: 70% of injuries happen to the upper extremity, many people have shoulder problems (tendinitis/dislocations, broken collar bone) Injuries: separations: 2 joints, acromioclavicular joint or sternoclavicular joint, fractures, clavicle, humerus/scapular less frequent, dislocations, glenohumeral or sternoclavicular joint, tendonitis/osis common, usually condition where arm comes over horizontal position (supraspinatus) The shoulder girdle: connects the upper limb to the axial skeleton on each side, contains two bones, clavicle and scapula, clavicle attaches medially to the sternal manubrium. Sternoclavicular joint: clavicle articulates with manubrium to form the sternoclavicular joint, only 25% of clavicles surface area in contact, least bony stability in the chain. Integrity of the joint comes from strong ligament attachment: disc between two surfaces shock absorber (?, only direct connection between upper extremity and trunk. Important for all movements, but especially abduction: clavicle can move freely forward/back, up and rotate.