Review of the dimensions of the median nerve and carpal tunnel using sonography in asymptomatic adults

Betty Mani, Radha Sarawagi, Rekha aley Cherian

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Objective: The study aims to establish the normal range of all sonologic measurements of carpal tunnel (CT) structures in an asymptomatic population. Methods: Sonological evaluation of 150 wrists in 75 asymptomatic adults was performed. The cross-sectional area (CSA) of the median nerve at four levels, the flattening ratio (FR) at three levels, the antero-posterior (AP) diameter of the CT and the distance of the transverse carpal ligament (TCL) from the trapezium-hamate (TmH) line were measured. Results: The mean (standard deviation (SD)) CSA of the median nerve at the distal forearm, CT inlet, mid and outlet were 6.8 (1.3), 7.4 (1.1), 7.5 (1.0), 7.1 (1.0) mm2, respectively. The mean (SD) FR at the CT inlet, mid and outlet were 2.66 (0.54), 2.55 (0.54), 3.69 (0.82), respectively. The mean (SD) AP diameter of the CT was 10.4 mm (1.1). Volar bowing of the retinaculum was seen in 7.3% of normal wrists. Conclusions: The normal range at two SDs of the CSA of the median nerve at the inlet was 5.2-9.6 mm2. The upper limit of volar bowing of the flexor retinaculum was 0.8 mm. The FR overlaps with values obtained in other studies of patients with carpal tunnel syndrome. The mean AP diameter of the CT was 10.4 mm (SD 1.1). To the best of our knowledge, this is the largest study performed in an asymptomatic population assessing the different sonological parameters related to the CT.

Original languageEnglish (US)
Pages (from-to)126-131
Number of pages6
JournalJournal of Medical Imaging and Radiation Oncology
Volume55
Issue number2
DOIs
StatePublished - Apr 1 2011

Fingerprint

Median Nerve
Wrist
Ultrasonography
Reference Values
Carpal Tunnel Syndrome
Ligaments
Forearm
Population

All Science Journal Classification (ASJC) codes

  • Oncology
  • Radiology Nuclear Medicine and imaging

Cite this

@article{04880c1716fd413f9b1041aa8f2e33b4,
title = "Review of the dimensions of the median nerve and carpal tunnel using sonography in asymptomatic adults",
abstract = "Objective: The study aims to establish the normal range of all sonologic measurements of carpal tunnel (CT) structures in an asymptomatic population. Methods: Sonological evaluation of 150 wrists in 75 asymptomatic adults was performed. The cross-sectional area (CSA) of the median nerve at four levels, the flattening ratio (FR) at three levels, the antero-posterior (AP) diameter of the CT and the distance of the transverse carpal ligament (TCL) from the trapezium-hamate (TmH) line were measured. Results: The mean (standard deviation (SD)) CSA of the median nerve at the distal forearm, CT inlet, mid and outlet were 6.8 (1.3), 7.4 (1.1), 7.5 (1.0), 7.1 (1.0) mm2, respectively. The mean (SD) FR at the CT inlet, mid and outlet were 2.66 (0.54), 2.55 (0.54), 3.69 (0.82), respectively. The mean (SD) AP diameter of the CT was 10.4 mm (1.1). Volar bowing of the retinaculum was seen in 7.3{\%} of normal wrists. Conclusions: The normal range at two SDs of the CSA of the median nerve at the inlet was 5.2-9.6 mm2. The upper limit of volar bowing of the flexor retinaculum was 0.8 mm. The FR overlaps with values obtained in other studies of patients with carpal tunnel syndrome. The mean AP diameter of the CT was 10.4 mm (SD 1.1). To the best of our knowledge, this is the largest study performed in an asymptomatic population assessing the different sonological parameters related to the CT.",
author = "Betty Mani and Radha Sarawagi and Cherian, {Rekha aley}",
year = "2011",
month = "4",
day = "1",
doi = "10.1111/j.1754-9485.2010.02225.x",
language = "English (US)",
volume = "55",
pages = "126--131",
journal = "Journal of Medical Imaging and Radiation Oncology",
issn = "1754-9477",
publisher = "Wiley-Blackwell",
number = "2",

}

Review of the dimensions of the median nerve and carpal tunnel using sonography in asymptomatic adults. / Mani, Betty; Sarawagi, Radha; Cherian, Rekha aley.

In: Journal of Medical Imaging and Radiation Oncology, Vol. 55, No. 2, 01.04.2011, p. 126-131.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Review of the dimensions of the median nerve and carpal tunnel using sonography in asymptomatic adults

AU - Mani, Betty

AU - Sarawagi, Radha

AU - Cherian, Rekha aley

PY - 2011/4/1

Y1 - 2011/4/1

N2 - Objective: The study aims to establish the normal range of all sonologic measurements of carpal tunnel (CT) structures in an asymptomatic population. Methods: Sonological evaluation of 150 wrists in 75 asymptomatic adults was performed. The cross-sectional area (CSA) of the median nerve at four levels, the flattening ratio (FR) at three levels, the antero-posterior (AP) diameter of the CT and the distance of the transverse carpal ligament (TCL) from the trapezium-hamate (TmH) line were measured. Results: The mean (standard deviation (SD)) CSA of the median nerve at the distal forearm, CT inlet, mid and outlet were 6.8 (1.3), 7.4 (1.1), 7.5 (1.0), 7.1 (1.0) mm2, respectively. The mean (SD) FR at the CT inlet, mid and outlet were 2.66 (0.54), 2.55 (0.54), 3.69 (0.82), respectively. The mean (SD) AP diameter of the CT was 10.4 mm (1.1). Volar bowing of the retinaculum was seen in 7.3% of normal wrists. Conclusions: The normal range at two SDs of the CSA of the median nerve at the inlet was 5.2-9.6 mm2. The upper limit of volar bowing of the flexor retinaculum was 0.8 mm. The FR overlaps with values obtained in other studies of patients with carpal tunnel syndrome. The mean AP diameter of the CT was 10.4 mm (SD 1.1). To the best of our knowledge, this is the largest study performed in an asymptomatic population assessing the different sonological parameters related to the CT.

AB - Objective: The study aims to establish the normal range of all sonologic measurements of carpal tunnel (CT) structures in an asymptomatic population. Methods: Sonological evaluation of 150 wrists in 75 asymptomatic adults was performed. The cross-sectional area (CSA) of the median nerve at four levels, the flattening ratio (FR) at three levels, the antero-posterior (AP) diameter of the CT and the distance of the transverse carpal ligament (TCL) from the trapezium-hamate (TmH) line were measured. Results: The mean (standard deviation (SD)) CSA of the median nerve at the distal forearm, CT inlet, mid and outlet were 6.8 (1.3), 7.4 (1.1), 7.5 (1.0), 7.1 (1.0) mm2, respectively. The mean (SD) FR at the CT inlet, mid and outlet were 2.66 (0.54), 2.55 (0.54), 3.69 (0.82), respectively. The mean (SD) AP diameter of the CT was 10.4 mm (1.1). Volar bowing of the retinaculum was seen in 7.3% of normal wrists. Conclusions: The normal range at two SDs of the CSA of the median nerve at the inlet was 5.2-9.6 mm2. The upper limit of volar bowing of the flexor retinaculum was 0.8 mm. The FR overlaps with values obtained in other studies of patients with carpal tunnel syndrome. The mean AP diameter of the CT was 10.4 mm (SD 1.1). To the best of our knowledge, this is the largest study performed in an asymptomatic population assessing the different sonological parameters related to the CT.

UR - http://www.scopus.com/inward/record.url?scp=79955054984&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79955054984&partnerID=8YFLogxK

U2 - 10.1111/j.1754-9485.2010.02225.x

DO - 10.1111/j.1754-9485.2010.02225.x

M3 - Article

C2 - 21501400

AN - SCOPUS:79955054984

VL - 55

SP - 126

EP - 131

JO - Journal of Medical Imaging and Radiation Oncology

JF - Journal of Medical Imaging and Radiation Oncology

SN - 1754-9477

IS - 2

ER -