injuries and poisoning
Rotator Cuff Injury Subacromial Bursitis
Introduction
The muscles that help hold the upper arm in the shoulder joint (the rotator cuff muscles) can get pinched (shoulder impingement syndrome), become inflamed (tendinitis), or can tear partially or completely. (See also Overview of Sports Injuries .) The shoulder is painful when the arm is moved over the head and later, even when the arm is not moved. Exercises help. The rotator cuff consists of the muscles that attach the shoulder blade to the head of the humerus. The rotator cuff strengthens the shoulder joint and helps rotate the upper arm. Rotator cuff pinching (impingement) and tendinitis often occur in sports that require the arms to be moved over the head repeatedly, such as pitching in baseball, lifting heavy weights over the shoulder, serving the ball in racket sports, and swimming freestyle, butterfly, or backstroke. Repeatedly moving the arm over the head causes the top of the arm bone to pinch the rotator cuff muscles against the top part of the shoulder blade and can result in inflammation and swelling of the muscles. If the movement is continued despite the inflammation, the tendon can weaken and tear. Even without overuse and chronic inflammation, the rotator cuff can be torn suddenly by a powerful movement (such as a severe stretch or pull) or a fall. 