KIN 3309 Lecture Notes - Lecture 6: Sternoclavicular Joint, Acromioclavicular Joint, Shoulder Joint
10 Feb 2017
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Document Summary
Shoulder complex: sternoclavicular, acromioclavicular, glenohumeral, scapulothoracic. Clavicle: site of muscle attachment, protection (trachea, esophagus, vessels, strut to stabilize shoulder and prevent medial displacement of humerus, prevent inferior migration of the shoulder girdle. Sternoclavicular joint: only point of skeletal attachment of the upper extremity. Acromioclavicular joint: high contact stresses, limits arm movements above the head. Glenohumeral joint: (cid:862)shoulder joint(cid:863, synovial, ball-and-socket, 3 degrees of rotational freedom. Scapulothoracic joint: false joint, muscles connect the scapula to the thorax. Movements of the shoulder complex: elevation/depression, protraction/retraction, horizontal flexion/extension, rotation, dislocation. Shoulder joint movement characteristics: large range of motion, extreme rom required by many activites, ligaments/muscles provide stability, scapulohumeral rhythm. Movement relationship between the humerus and scapula during arm raising movements. Capitulum of the humerus and head of the radius: ulnohumeral joint. Angle between ulna and humerus with elbow extended. 10-15 in males, 25-25 in females: radioulnar joint. Elbow movements: limited by soft tissue/ligaments/joint capsule/muscles, 24 muscles cross the elbow.
