Osteoarthritis

Osteoarthritis is the most common type of arthritis, especially among older people. Sometimes it is called degenerative joint disease or osteoarthrosis. Osteoarthritis is a joint disease that mostly affects the cartilage (KAR-til-uj). Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage allows bones to glide over one another. It also absorbs energy from the shock of physical movement. In osteoarthritis, the surface layer of cartilage breaks down and wears away. This allows bones under the cartilage to rub together, causing pain, swelling, and loss of motion of the joint. Over time, the joint may lose its normal shape. Also, bone spurs--small growths called osteophytes--may grow on the edges of the joint. Bits of bone or cartilage can break off and float inside the joint space. This causes more pain and damage.

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About this information: These definitions were provided by the Centers for Disease Control, the National Institutes for Health and other government health agencies. This information is for educational purposes only. If you are concerned about your health or your child's health, please consult your family's health care provider immediately. This information is not a substitute for personal medical attention, diagnosis or treatment.