The labrum is a “cuff” of cartilage that extends the size of the shoulder socket (glenoid) holding the arm (humerus) in place. It is not to be confused with the “rotator cuff,” which is a composite structure of muscles and tendons.
The labrum is susceptible to sudden, traumatic injury, as well as wear over time and brittleness with age. Aches, limited range of motion, or pain associated with certain positions or activities may indicate this kind of injury. One particular type of labrum tear is often seen in connection with overhand movements such as serving a tennis ball or pitching a baseball. Labrum tears can sometimes be treated non-surgically.