What causes volar dislocation in rheumatoid arthritis (RA)?

Updated: Jan 11, 2019
  • Author: Michael Neumeister, MD, FRCSC, FACS; Chief Editor: Joseph A Molnar, MD, PhD, FACS  more...
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Answer

Answer

Volar dislocation or subluxation is also caused by weakening of the collateral ligaments and by weakening of the dorsal extensor mechanism when the extensor tendons are dislocated between the metacarpal heads. As a result, no force counters the extrinsic and intrinsic flexors, and a flexion contraction at the MP joint occurs, which is evident by prominent metacarpal heads.


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