common types of arthritis
Arthritis. Arthritis is a general term for conditions that affect the joints and surrounding tissues. Joints are places in the body where bones come together, such as the knees, wrists, fingers, toes, and hips. The two most common types of arthritis are osteoarthritis and rheumatoid arthritis.1  Osteoarthritis (OA) is a painful, degenerative joint disease that often involves the hips, knees, neck, lower back, or small joints of the hands.oints are places in the body where bones come together, such as the knees, wrists, fingers, toes, and hips. The two most common types of arthritis are osteoarthritis and rheumatoid arthritis.