http://www.niams.nih.gov/Health_Info/Shoulder_Problems/default.asp
National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health
This fact sheet presents a general overview of the shoulder and shoulder problems as well as answers questions about specific shoulder problems (dislocation, separation, tendonitis, bursitis, impingement syndrome, torn rotator cuff, frozen shoulder, and fracture), and diseases that can cause shoulder pain.