What causes thumb deformities in rheumatoid arthritis (RA)?

Updated: Jun 11, 2021
  • Author: Michael Neumeister, MD, FRCSC, FACS; Chief Editor: Joseph A Molnar, MD, PhD, FACS  more...
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The deformities of the thumb that arise from RA are similar yet, in many ways, different from those of the fingers. Significant forces are placed at the IP, MP, and carpometacarpal (CMC) joint of the thumb in daily activities that promote significant degeneration in the face of proliferative synovitis of RA.

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