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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.
Osteoarthritis (also referred to as degenerative joint disease or wear-and-tear arthritis) is caused by the breakdown of joint cartilage. Cartilage acts as a cushion between the bones that form a joint. Cartilage loss can cause bone to rub on bone in a joint -- a condition that is very painful. Usually osteoarthritis begins in a single joint. Rheumatoid arthritis is a chronic, inflammatory type of arthritis. It is also classified as an autoimmune disease (i.e., immune cells attack the body's own healthy tissues). The synovium (lining of the joint) is primarily affected by rheumatoid arthritis, but organs body-wide can be affected as well.