Osteoarthritis (OA) is the most common type of arthritis. It is also known as:

  • degenerative joint disease
  • degenerative arthritis
  • wear-and-tear arthritis

OA is a disease of aging. According to the Centers for Disease Control and Prevention (CDC),, OA affects more than 25 million men and women over the age of 25 in the United States. That is almost 14 percent of all adults. It is even more common in the elderly. More than one-third of adults over the age of 65 suffer from OA.