Osteoarthritis is the most common form of arthritis in the U.S. While osteoarthritis can affect any joint in your body, the disorder most commonly affects joints in your knees, hands, hips, feet, and spine. Osteoarthritis commonly occurs after the age of 40 and gradually worsens over time.
Osteoarthritis joints occur when the cartilage of your bones wear away over time, or when there is a loss or damage to cartilage, the main cause is unknown. This loss of shock absorption causes inflammation and pain.