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Swimmer's shoulder; Pitcher's shoulder; Shoulder impingement syndrome; Tennis shoulder; Tendinitis - rotator cuff; Rotator cuff tendinitis; Shoulder overuse syndrome
The rotator cuff is a group of muscles and tendons that attach to the bones of the shoulder joint, allowing the shoulder to move and keeping it stable.
The shoulder joint is a ball and socket type joint where the top part of the arm bone (humerus) forms a joint with the shoulder blade (scapula). The rotator cuff holds the head of the humerus into the scapula and controls movement of the shoulder joint.
The tendons of the rotator cuff pass underneath a bony area on their way to attaching the top part of the arm bone. When these tendons become inflamed, they can become more frayed over this area during shoulder movements. Sometimes, a bone spur may narrow the space even more.
This problem is called rotator cuff tendinitis, or impingement syndrome, and may be due to:
Poor posture over many years and the usual fraying of the tendons that occurs with age may also lead to rotator cuff tendinitis.
Rotator cuff tears may occur in two ways:
There are two types of rotator cuff tears:
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