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残疾的常见原因，在美国每年由于肩袖问题就医的人数将近200万。
肩袖撕裂会使肩部活动无力，导致许多日常活动（例如梳头或穿衣服）会变得痛苦和困难。
Anatomy
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.
解剖学
肩由三块骨构成: 肱骨、肩胛骨和锁骨。肩是一个球窝关节: 由肱骨头和肩胛骨的浅窝构成。
This illustration of the shoulder highlights the major components of the joint.
肩插图显示了肩关节的主要组成部分。
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.
肱骨被肩袖连接至关节窝，肩袖由四块肌肉组成，它们的肌腱覆盖肱骨头。肩袖将肱骨与肩胛骨连接，协助抬起和旋转手臂。
The rotator cuff tendons cover the head of the humerus (upper arm bone), helping you to raise and rotate your arm.
肩袖肌腱包绕肱骨头，协助抬起和旋转手臂。
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.
在肩袖和肩峰之间有滑囊，活动手臂时，滑囊可使肩袖肌腱自由滑动。当肩袖肌腱受伤或受损时，滑囊也会发炎和疼痛。
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