What is the difference between RA and OA?
While RA is an autoimmune disease, osteoarthritis, or OA is often described as a disease of “wear and tear.” In other words, for most people with osteoarthritis, the cartilage in the joints can wear out because of mechanical damage from years of use. OA is very common; 10% of people will develop OA in their lifetime and that number increases with age. Common joints in OA are weight bearing joints and the spine.
