• Hung Youl Seok, Jae Hong Jang, Sun Jae Won, Joon Shik Yoon, Kyung Seok Park, and Byung-Jo Kim.
• Department of Neurology, Korea University College of Medicine, Seoul, #73, Inchon-ro, Seongbuk-gu, Seoul, 136-705, South Korea.
• Muscle Nerve. 2014 Oct 1; 50 (4): 564-70.

IntroductionCross-sectional area (CSA) reference values of lower extremity nerves using ultrasonography have only been reported in a few studies and have been limited to white populations.MethodsFor this study, 94 healthy Korean volunteers were recruited for measurement of the CSA at 7 sites of lower extremity nerves. The side-to-side difference in CSA was calculated for each nerve, and reference ranges were derived. External validity evaluation for the reference values was performed with 10 newly recruited volunteers at a different institution.ResultsNerve CSA was correlated significantly with body mass index, weight, and height; however, the absolute value of the side-to-side difference had no significant correlation with demographic factors. The external validity was adequate for all sites, ranging from 80% to 100%.ConclusionsThe lower extremity nerve CSA values obtained in this study may provide normal reference values for the Asian population.Copyright © 2014 Wiley Periodicals, Inc.

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