The biceps muscle has two attachments at your shoulder. One is outside the joint and rarely ruptures. The other attachment (the long head) is formed by a long, thin tendon which runs up a very shallow groove on the front part of the humerus (arm bone). Once it reaches shoulder level it turns into the ball and socket joint and attaches to the top of the socket. The biceps tendon is often injured or torn in conjunction with rotator cuff tears. We always examine the biceps tendon carefully as part of arthroscopic shoulder surgery. Generally if there is a problem with the tendon, it is best to fix this at the time of surgery rather than leave it as a source of pain in the shoulder joint.
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