Osteoarthritis is the degeneration of cartilage within joints. It is also known as degenerative joint diseases, degenerative arthritis, and hypertrophic arthritis.

Over 25 million people in the United States are affected by the condition making it the most common form of arthritis.

Further Reading:

Arthritis Foundation: Osteoarthritis

American Academy of Orthopaedic Surgeons: Osteoarthritis