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Osteoarthritis (OA, also known as degenerative arthritis or degenerative joint disease, and sometimes referred to as "arthrosis" or "osteoarthrosis"), is a condition in which low-grade inflammation results in pain in the joints, caused by wearing of the cartilage that covers and acts as a cushion inside joints.

As the bone surfaces become less well protected by cartilage, the patient experiences pain upon weight bearing, including walking and standing.

Note:   The above text is excerpted from the Wikipedia article "Osteoarthritis", which has been released under the GNU Free Documentation License.
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December 1, 2015

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updated 12:56 pm ET