Shoulder Impingement S yndrome. Shoulder Impingement S yndrome. P ainful A rc Syndrome Supraspinatus Syndrome Swimmer's Shoulder Thrower's S houlder. Shoulder Impingement S yndrome.
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Occurs when one of the rotator cuff tendons (supraspinatus) or bursa (a flat, fluid-filled membrane that prevents the shoulder parts from rubbing together) is pinched between the ‘ball’ part of the upper bone (the humeral head) and the undersurface of the top of the shoulder blade (acromion).
This happens because as we raise our arm, the narrow space between the top of our arm bone (the humeral head) and the top of the shoulder blade naturally compresses.
It is the repetition of such movements that ultimately leads to the condition developing, causing swelling and an excess of fluid in the joint.
The impinging structures may be removed in surgery, and the subacromial space may be widened by resection of the distal clavicle and excision of osteophytes on the under-surface of the acromioclavicular join