Anatomical shoulder complex study guide .pdf - Shoulder complex \u25cf Freely movable \u25cf Subject to a lot of injuries in some sports \u25cf Older people a

Anatomical shoulder complex study guide .pdf - Shoulder...

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Shoulder complex Freely movable Subject to a lot of injuries in some sports Older people: a lot of overhead movements 4 joints Movements of the shoulder GH- glenoid fossa and head of humerus (arm movement) ST- scapula throxic (movement inside that you can not see) Glenoid fossa- built for mobility not for stability Loose ball and socket Hip tight ball and socket Bones Humerus Scapula Clavicle Articulations There are 4 articulations that make up the shoulder complex: 1. Glenohumeral joint (GH) 2. Acromioclavicular joint (AC) 3. Sternoclavicular joint (SC) 4. Scapulothoracic joint (ST)- not a true joint Ligaments and Stabilization of the GH articulation Gleno- humeral ligament Capsular sleeve Rotator cuff tendons (Sits Muscles)- act like ligaments Keep arm attached
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AC Ligament Acromio Clavicular ligament Coraco Clavicular Ligament 2 major ligaments that hold down the clavicle SC ligament
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Streno Clavicular ligament Number one bone that can break because it’s not protected by muscle Cartilage Glenoid fossa Glenoid labrum- cup on the fossa; like a suction cup, its vacuum tight Shoulder Bursa All joints have bursa sac Lubricate the joint
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As you get older they get dry and get sticky Best thing to prevent drying is movement What are they? Why? Fibrous pockets that contain a lubricating fluid Decrease irritating effects of friction Build of friction between bones and tendons, skin and bone, muscle and bone Found near a tendon insertion and between muscle layers Shoulder Bursae Subacromion Subdeltoid Subscapularis
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Bursitis Bursa- loose and thin! What happens with age? Tight, thick and dry What happens with injury?- become filled with scar tissue from previous injuries- especially people with atrophy or overuse in athletes Inflammation and swelling frequently accompany degeneration When felt the most??- infection or pinch of abduction Elevation of the arm allows contact between muscles and adjacent structures Sometimes it’s the tendon Same treatment for bursitis and tendonitis Same pain for older people and athletes Rotator Cuff Sits muscles Hold the head of the humerus Supraspinatus One on top of shoulder (abduction) Infraspinatus Teres minor Work together with infraspinatus and are external rotators; located in the back Subscapularis In front; internal rotator
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Rotational functions on the humerus Their tendons are interwoven into the capsule to form a muscule/tendinous cuff around the joint Stabilize the joint against dislocation Deep muscles and are small Overhand patterns of exercise Abduction and external rotation, high velocity, great force and repetition- carries the risk of tear Individuals return after surgery?
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