Trauma or overuse can cause the shoulders soft tissues (ligaments, tendons, muscles and cartilage) to stretch or tear. Then they can no longer provide the necessary support. A feeling of "looseness" may develop and the shoulder may "pop out" with some activities. Pain and weakness may interfere with daily activities such as work, sports, or sleep.
A shoulder separation can result from a blow to your shoulder or a fall on your shoulder. It also can result from a fall on your outstretched hand or arm. It is a common injury in contact sports such as football, rugby, hockey, or lacrosse. It may occur from falling onto a hard surface, such as might happen during downhill skiing, volleyball, rock climbing, and soccer.
Shoulder arthroscopy is performed under sterile conditions following an injection of a local anesthetic into the joint and/or general anesthesia.
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A rotator cuff injury is a strain or tear in the group of tendons and muscles that hold your shoulder joint together and help move your shoulder. A rotator cuff injury may result from:
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Impingement from bone spurs
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using your arm to break a fall
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falling onto your arm
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lifting a heavy object
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normal wear and tear in an older person
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use of your shoulder in sports with a repetitive overhead movement, such as swimming, baseball (mainly pitchers), football, and tennis, which gradually strains the tendon
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manual labor such as painting, plastering, raking leaves, or housework
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