What is the cardinal sign of 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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Sudden loss of finger extension or flexion is the cardinal sign of tendon rupture. Usually, it is painless and can occur during normal use of the hand. Patients with RA frequently ignore the new development, because it may be subtle in the context of the other constraints on their normal function.

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