Osteoarthritis (OA) is among the most common forms of arthritis in the United States. Also known as degenerative joint disease, it starts with a breakdown of joint cartilage that results in pain and stiffness.

Among the upper body joints, it most frequently affects the fingers. Nearly 90 percent of women and 80 percent of men between the ages of 75 and 79 have X-ray evidence of osteoarthritis in their hands. Read more about Arthritis.