What causes tendon rupture 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 2 main causes of tendon rupture are chronic attrition of the tendon over a bony prominence and synovial invasion of the tendon. The most frequent sites for extensor tendon rupture are at the distal end of the ulna or at the Lister tubercle, which acts like a fulcrum for the extensor pollicis longus (EPL) tendon.

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