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126)Her pain is probably caused by injury to the rotator cuff, which can result from repetitive motion, trauma, or excessiveforce. The rotator cuff consists of the tendons of four muscles that stabilize the shoulder joint. If torn, surgical repairmay be indicated.127)Osteoarthritis is a "wear-and-tear" disease seen usually in the elderly. Rheumatoid arthritis is an autoimmune diseasein which the body's immune system attacks synovial joints, triggered by an infection or some other cause.21