The American Academy of Orthopaedic Surgeons
Orthopaedic Knowledge Online
Osteoarthritis
Osteoarthritis
Osteoarthritis is a progressive, painful, currently incurable disease caused by the wearing away of cartilage on the ends of bones within a joint. It is the most common type of arthritis and primarily affects the weight-bearing joints of the lower extremity and the spine. Osteoarthritis is most often associated with age, obesity, previous trauma, or other disorders that change the mechanics of the joint.

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Osteoarthritis affects more than 40 million Americans and more than a quarter of the population between the ages of 45 and 64 years.

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Treatment

Resources developed by the American Academy of Orthopaedic Surgeons to help patients and physicians understand recommended guidelins for treatment.

AAOS Osteoarthritis of the Knee Treatment Guideline
What Causes Osteoarthritis?
Is Osteoarthritis the Same Thing as Rheumatoid Arthritis?

Osteoarthritis, sometimes called "wear and tear" arthritis, usually develops after many years and affects people who are middle aged or older. Other risk factors for osteoarthritis include obesity, injury to a joint, and family history of osteoarthritis.

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Osteoarthritis should not be confused with rheumatoid arthritis. In rheumatoid arthritis, the joint linings become thickened and produce substances that destroy the joint surfaces.

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