title: Correlating ultrasound findings of carpal tunnel syndrome with nerve conduction studies.
abstract: BACKGROUND
  The aim of this study was to make correlations between ultrasonographic measurements of thenar muscle and flexor retinaculum and nerve conduction studies (NCS) in carpal tunnel syndrome (CTS).
  
  
  METHODS
  Ultrasound and NCS were performed on 92 wrists with CTS and on 40 wrists from healthy individuals. Ultrasound of thenar and hypothenar muscles, flexor retinaculum, and median nerve were assessed. The ultrasonographic findings were compared between the 2 groups, and correlation analyses between median latency and ultrasonographic findings were performed.
  
  
  RESULTS
  Motor latency correlated positively with flexor retinaculum thickness (FRT) and negatively with the ratio of thenar to hypothenar muscle. FRT and motor latency were found to be increased significantly in CTS. The ratio of thenar to hypothenar muscle was found to be decreased significantly in CTS compared with controls.
  
  
  CONCLUSIONS
  The ultrasonographic findings of FRT and thenar muscle reflect the severity of disease in patients with CTS and are valuable for the diagnosis of CTS.
authors.affiliation: Department of Rehabilitation Medicine, Incheon St. Mary Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea.
authors.forename: Jae Min
authors.initials: JM
authors.lastname: Kim
authors.forename: Min Wook
authors.initials: MW
authors.lastname: Kim
authors.forename: Young Jin
authors.initials: YJ
authors.lastname: Ko
mesh_terms: D000200:Action Potentials; D000328:Adult; D000368:Aged; D002349:Carpal Tunnel Syndrome / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D004558:Electric Stimulation; D005260:Female; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000000981:diagnostic imaging / Q000503:physiopathology; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging / Q000503:physiopathology; D009431:Neural Conduction / Q000502:physiology*; D009460:Neurologic Examination; D011930:Reaction Time / Q000502:physiology; D013223:Statistics as Topic; D014463:Ultrasonography; D014953:Wrist / Q000294:innervation
keywords: carpal tunnel syndrome; flexor retinaculum; nerve conduction study; thenar muscle; ultrasound