Causes | Symptoms | Diagnosis | Treatment Your shoulder is one of the most important and complex joints in your body, with three different bones—the scapula (shoulder blade), humerus (upper arm, and clavicle (collarbone)—working together in a ball-and-socket joint. At the location where the socket component of the scapula attaches to the humerus is a piece of soft tissue, called a labrum, that provides cushioning … [Read more...]