Complete tear of the main fibrous cords of connective tissue that attach the top of the biceps muscle to the scapula. Predominantly involving the long head of the proximal biceps tendon. Most commonly occurs in individuals aged 40-60 years from effects of chronic wear but can occur in younger individuals due to athletic injury or trauma.

Patients may report experiencing a sudden, sharp pain (and sometimes an audible pop or snap) in the anterior shoulder and upper arm, or they may complain of recurrent pain during activity. Pain may be nondescript or absent, with patients presenting with a palpable "bulge" in the upper arm between the elbow and shoulder. Other symptoms include cramping, bruising, and weakness.