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Osteoarthritis is a joint disease that mostly affects cartilage. Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage allows bones to glide over each other. It also helps absorb shock of movement.
The degeneration of cartilage exposes the bones of the joint and allows bone on bone contact. This can cause: pain; stiffness; reduced range of motion; changes in joint appearance; Osteoarthritis can affect any joint in your body, but the most commonly affected areas are: hands; hips; knees; neck; lower back; Not all joint pain and stiffness is caused by OA. Rheumatoid arthritis (RA) can cause similar pain, but there are a number of physical symptoms that differentiate RA, an inflammatory disease, from OA. One readily visible difference is that RA, unlike OA, is typically symmetrical. If it affects a joint on one side of the body, it will generally affect the same joint on the other.