Median nerve deformation and displacement in the carpal tunnel during finger motion

Yuichi Yoshii, Tomoo Ishii, Wen Lin Tung, Shinsuke Sakai, Peter C. Amadio

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The objective of this study was to evaluate the correlations between deformation and displacement of median nerve and flexor tendons during finger motion in the carpal tunnel for both carpal tunnel syndrome (CTS) patients and healthy controls. Sixty-two wrists of 31 asymptomatic volunteers and fifty-one wrists of 28 idiopathic CTS patients were evaluated by ultrasound. The displacement of the median nerve and the middle finger flexor digitorum superficialis (FDS) tendon, as well as area, perimeter, aspect ratio of a minimum enclosing rectangle, and circularity of the median nerve were measured in finger extension and flexion positions. Deformation indices were defined as the ratios of indices in finger extension and flexion positions. The correlations between displacement and deformation indices were evaluated. There were significant correlations between nerve palmar-dorsal displacement and deformation indices (p < 0.05). The aspect ratio deformation index showed the strongest correlation to palmar-dorsal displacement of the nerve (-0.572, p < 0.01). This study showed that there is a relationship between median nerve deformation indices and nerve palmar-dorsal displacement in the carpal tunnel. Since the highest correlations were between palmar-dorsal nerve displacement direction and aspect ratio deformation index, these parameters may be helpful to understand the pathophysiology of CTS.

Original languageEnglish (US)
Pages (from-to)1876-1880
Number of pages5
JournalJournal of Orthopaedic Research
Issue number12
StatePublished - Dec 2013


  • carpal tunnel syndrome
  • deformation
  • displacement
  • median nerve
  • ultrasound

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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