Osteoarthritis (OA) is the most common form of arthritis. It is sometimes called degenerative joint disease or “wear and tear” arthritis. It most frequently occurs in the hands, hips, and knees.
With OA, the cartilage and bones within a joint begin to break down. These changes usually develop slowly and get worse over time. OA can cause pain, stiffness, and swelling, and can result in disability.