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Clinical Medicine & Research
Volume 4, Number 3 : 160
doi:10.3121/cmr.4.3.160
© 2006 Marshfield Clinic
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Letter

CarpalTunnel Syndrome – Adduction versus Abduction

Editor - Sansone et al1 describe the findings of carpal tunnel syndrome in a recent article in Clinical Medicine & Research. In this article, the authors repeatedly describe weakness of thumb adduction as a sign of a carpal tunnel syndrome and cite the 2000 JAMA article by D’Arcy and McGee2 as support of these statements; however, it is thumb abduction, by the abductor pollicis muscle, which is weak in carpal tunnel syndrome.2 Weakness of thumb adduction is due to a problem of the adductor pollicis muscle, which is mainly innervated by the ulnar nerve. The typical sign of such an ulnar palsy is the Froment’s sign, named after the French physician, Jules Froment.

Andreas Horst, MD, Neurologist

Kantonsspital Winterthur, Switzerland, User{at}Horst.ch

  1. Sansone JM, Gatzke AM, Aslinia F, Rolak LA, Yale SH. Jules Tinel (1879–1952) and Paul Hoffmann (1884–1962). Clin Med Res 2006;4:85–89.[Free Full Text]
  2. D’Arcy CA, McGee S. The rational clinical examination. Does this patient have carpal tunnel syndrome? JAMA 2000;283:3110–3117.[Abstract/Free Full Text]




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