The shoulder is the most complex and unstable joint in the body, so it can get injured easily.
Most surgeries on the shoulder are to repair the muscles, connective tissue or damaged joints that can arise from traumatic injuries and wear/tear or repetitive strain or overuse injuries to the shoulder. We see a lot of rotator cuff and impingement repairs that have been done with arthroscopic surgery. This minimally invasive surgery is less traumatic than open surgery but is still often hard to recover from as the patient has usually gone through months of movement dysfunction and pain in order to qualify for surgery.
We also see people with total shoulder replacement who have suffered traumas and from exposure to very challenging work environments. Ideally we see the patient before the surgery and have managed to ease some of our patients symptoms enough to postpone the surgery.