Total shoulder arthroplasty is the main treatment option in cases of severe osteoarthritis.
A damaged joint is usually the final result of arthritis, which is commonly idiopathic (i.e. of unknown cause) or might be due to other causes, such as injury (e.g. fracture), shoulder rotator cuff tear (e.g. rotator cuff arthropathy), chronic disease (e.g. rheumatoid arthritis) etc.