Osteoarthritis is a progressive, degenerative joint disease characterized by chronic inflammation of the joint lining. People with osteoarthritis usually have joint pain and limited movement of the affected joint.

Joints Affected by Osteoarthritis
Copyright © Nucleus Medical Media, Inc.

Healthy cartilage is a cushion between the bones in a joint. With osteoarthritis, the cartilage wears away over a long period of time, causing bones to rub together. The exact cause is unclear, but it may be a combination of genetics and environment.