Kinesiology 2236A/B Lecture Notes - Lecture 12: Acromioclavicular Joint, Shoulder Joint, Shoulder Problem

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The upper extremity: ue articulation with the thorax- aka shoulder, full of complex joints, sternoclavicular, acromioclavicular, scapulothoracic, glenohumeral. Background: 70% of injuries happen to 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, glenohumoral or sternoclavicular joint, tendonitis/ osis common, usually condition where arm comes over horizontal position. The shoulder girdle: connects the upper limb to the axial skeleton on each side, contains 2 bones, clavicle and scapula, clavicle attaches medially to the sternal manubrium, laterally to the acromion process of the scapula. Sternoclavicular joint: clavicle articulates with manubrium to form the sternoclavicular joint, only 25 % of clavicle"s surface area in contact, least bony stability in the chain. Sternoclavicular ligament, interclavicular ligament, and the costalclavicular: you also have an articular disc, sternoclavicular injury, mva and sports injuries most common causes of injury, can be, direct - blow to clavicle.

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