title: Correlation between Ultrasonography Findings and Electrodiagnostic Severity in Carpal Tunnel Syndrome: 3D Ultrasonography.
abstract: OBJECTIVE
  To determine the correlation between the cross-sectional area (CSA) of the median nerve measured at the wrist using three-dimensional (3D) ultrasonography (US) and the electrophysiological severity of carpal tunnel syndrome (CTS).
  
  
  METHODS
  We prospectively examined 102 wrists of 51 patients with clinical CTS, which were classified into 3 groups according to the electrodiagnostic (EDX) findings. Median nerve CSAs were measured using 3D US at the carpal tunnel inlet and at the level of maximal swelling.
  
  
  RESULTS
  Ten wrists were negative for CTS. Of the 92 CTS-positive wrists, 23, 30, and 39 were classified as having mild, moderate, and severe CTS, respectively. The median nerve CSA differed significantly between the severe- and moderate-CTS groups (p=0.0007 at the carpal tunnel inlet and p<0.0001 at the maximal swelling site). There was a correlation between median nerve CSA and EDX parameters among those wrists with severe and mild CTS (p<0.0001 at both sites).
  
  
  CONCLUSIONS
  The median nerve CSA as measured by 3D US could provide additional information about the severity of CTS, as indicated by the strong correlation with standard EDX findings.
authors.affiliation: Department of Physical Medicine & Rehabilitation, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
authors.forename: Hee Kyu
authors.initials: HK
authors.lastname: Kwon
authors.affiliation: Department of Physical Medicine & Rehabilitation, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
authors.forename: Hyo Jung
authors.initials: HJ
authors.lastname: Kang
authors.affiliation: Department of Physical Medicine & Rehabilitation, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
authors.forename: Chan Woo
authors.initials: CW
authors.lastname: Byun
authors.affiliation: Department of Physical Medicine & Rehabilitation, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
authors.forename: Joon Shik
authors.initials: JS
authors.lastname: Yoon
authors.affiliation: Department of Radiology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
authors.forename: Chang Ho
authors.initials: CH
authors.lastname: Kang
authors.affiliation: Department of Physical Medicine & Rehabilitation, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
authors.forename: Sung Bum
authors.initials: SB
authors.lastname: Pyun
keywords: carpal tunnel syndrome; cross-sectional area; electrophysiological severity; median nerve; three-dimensional ultrasonography