Based on x-ray evidence, the distal and proximal interphalangeal joints of the hand are most commonly affected by osteoarthritis, though they do not usually exhibit typical symptoms associated with the disease.
The hips and knees are the next most common sites of osteoarthritis and are almost always symptomatic.
The first metatarsal phalangeal and carpometacarpal joints also are common sites of osteoarthritis observed on x-ray but the shoulder, elbow, wrist, and metacarpophalangeal joints are rare sites of osteoarthritis unless related to injury or trauma.
Info from , Read complete article at : http://osteoarthritis.about.com/od/osteoarthritis101/a/what_is_OA.htm
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