Enlarged median nerve in idiopathic carpal tunnel syndrome

Muscle Nerve. 2000 Nov;23(11):1713-8. doi: 10.1002/1097-4598(200011)23:11<1713::aid-mus7>3.0.co;2-g.


To delineate change in median nerve size in carpal tunnel syndrome (CTS), we compared ultrasonograms of nerve cross-sections from patients (201 wrists of 125 women with idiopathic CTS) and controls (200 dominant wrists of 200 women). Major and minor axes, cross-sectional area, and the flattening ratio (major axis/minor axis) were measured at four levels: 1, distal edge of the flexor retinaculum; 2, center of the hook of the hamate; 3, wrist crease; and 4, distal one-third level of the forearm. Axes and areas were greater in the patients at levels 1, 2, and 3. The flattening ratio was greater in the controls at levels 1 and 2, and in the patients at level 3. When the groups were combined, there were linear correlations between the cross-sectional nerve area and electrophysiologic severity at levels 1, 2, and 3. These findings indicate that idiopathic CTS is characterized by severity-correlated intracarpal enlargement of the median nerve and not by compressive deformation, such as a reduction in the caliber of the nerve.

MeSH terms

  • Adult
  • Aged
  • Carpal Tunnel Syndrome / diagnostic imaging
  • Carpal Tunnel Syndrome / etiology
  • Carpal Tunnel Syndrome / pathology*
  • Case-Control Studies
  • Cross-Sectional Studies
  • Electrophysiology
  • Female
  • Humans
  • Median Nerve / pathology*
  • Middle Aged
  • Neural Conduction
  • Neurons, Afferent / physiology
  • Reproducibility of Results
  • Ultrasonography / standards