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A systematic review: normative reference values of the median nerve cross-sectional area using ultrasonography in healthy individuals.

Authors:
Audrey Jing Ting Ng Ramya Chandrasekaran Ashutosh Prakash Sreenivasulu Reddy Mogali

Sci Rep 2022 06 2;12(1):9217. Epub 2022 Jun 2.

Lee Kong Chian School of Medicine, Nanyang Technological University Singapore, 11 Mandalay Road, 308232, Singapore, Singapore.

Median nerve cross-sectional area (CSA) was used for screening and diagnosis of neuropathy, but few studies have suggested reference range. Hence, this systematic review was performed to evaluate a normative values of median nerve CSA at various landmarks of upper limb based on ultrasonography. PubMed and Web of science were used to search relevant articles from 2000 to 2020. Forty-one eligible articles (2504 nerves) were included to access median nerve CSA at different landmarks (mid-arm, elbow, mid-forearm, carpal tunnel (CT) inlet and CT outlet). Data was also stratified based on age, sex, ethnicity, geographical location, and method of measurement. Random effects model was used to calculate pooled weighted mean (95% confidence interval (CI), [upper bound, lower bound]) at mid-arm, elbow, mid-forearm, CT inlet and outlet which found to be 8.81 mm, CI [8.10, 9.52]; 8.57 mm [8.00, 9.14]; 7.07 mm [6.41, 7.73]; 8.74 mm [8.45, 9.03] and 9.02 mm [8.08, 9.95] respectively. Median nerve CSA varies with age, geographical location, and sex at all landmarks. A low (I < 25%) to considerable heterogeneity (I > 75%) was observed, indicating the variation among the included studies. These findings show that median nerve CSA is varying not only along its course but also in other sub-variables.

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http://dx.doi.org/10.1038/s41598-022-13058-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9163181PMC
June 2022

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