http://www.niams.nih.gov/Health%5FInfo/Osteoarthritis/default.asp
National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health
This guide discusses osteoarthritis -- the most common type of arthritis, especially among older individuals. Osteoarthritis symptoms (pain, swelling, and loss of motion) and treatments are covered and some helpful therapy is illustrated.