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Uptodate Reference Title
Carpometacarpal (CMC) osteoarthritis
Carpometacarpal (CMC) osteoarthritis
The normal width of the articular cartilage should be 2 mm. In this case, the articular cartilage has worn away. The trapezium has also lost its normal saddle shape, and the metacarpal bone has subluxed 2 to 3 mm. These findings are consistent with advanced CMC osteoarthritis.