Thumb-base osteoarthritis

Thumb-base OA: prominence and "squaring" of the thumb base, due to osteophyte formation and subluxation at the first CMC joint.

OA: osteoarthritis; CMC: carpometacarpal.

Reproduced with permission from: OARSI Online Primer. Edited by Henrotin Y, Hunter D, Kawaguchi H. 2012. Osteoarthritis Research Society International. (http://primer.oarsi.org).

Graphic 105818 Version 1.0

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