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A rotator cuff tear is a common cause of pain and disability among adults. Each year, almost 2 million people in the United States visit their doctors because of a rotator cuff problem.A torn rotator cuff will weaken your shoulder. This means that many daily activities, like combing your hair or getting dressed, may become painful and difficult to do.肩袖撕裂是成年人疼痛和殘疾的常見原因，在美國每年由于肩袖問題就醫(yī)的人數(shù)將近200萬。肩袖撕裂會使肩部活動無力，導(dǎo)致許多日?；顒樱ɡ缡犷^或穿衣服）會變得痛苦和困難。Your shoulder is made up of three bones: your upper arm bone (humerus), your shoulder blade (scapula), and your collarbone (clavicle). The shoulder is a ball-and-socket joint: the ball, or head, of your upper arm bone fits into a shallow socket in your shoulder blade.肩由三塊骨構(gòu)成: 肱骨、肩胛骨和鎖骨。肩是一個球窩關(guān)節(jié): 由肱骨頭和肩胛骨的淺窩構(gòu)成。 
This illustration of the shoulder highlights the major components of the joint.肩插圖顯示了肩關(guān)節(jié)的主要組成部分。Your arm is kept in your shoulder socket by your rotator cuff. The rotator cuff is a group of four muscles that come together as tendons to form a covering around the head of the humerus. The rotator cuff attaches the humerus to the shoulder blade and helps to lift and rotate your arm.肱骨被肩袖連接至關(guān)節(jié)窩，肩袖由四塊肌肉組成，它們的肌腱覆蓋肱骨頭。肩袖將肱骨與肩胛骨連接，協(xié)助抬起和旋轉(zhuǎn)手臂。 
The rotator cuff tendons cover the head of the humerus (upper arm bone), helping you to raise and rotate your arm. 肩袖肌腱包繞肱骨頭，協(xié)助抬起和旋轉(zhuǎn)手臂。 There is a lubricating sac called a bursa between the rotator cuff and the bone on top of your shoulder (acromion). The bursa allows the rotator cuff tendons to glide freely when you move your arm. When the rotator cuff tendons are injured or damaged, this bursa can also become inflamed and painful.在肩袖和肩峰之間有滑囊，活動手臂時，滑囊可使肩袖肌腱自由滑動。當(dāng)肩袖肌腱受傷或受損時，滑囊也會發(fā)炎和疼痛。
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