title: Ultrasonographic reference values for assessing normal radial nerve ultrasonography in the normal population.
abstract: High-resolution ultrasound has been used recently to characterize median and ulnar nerves, but is seldom used to characterize radial nerves. The radial nerve is more frequently involved in entrapment syndromes than the ulnar and median nerves. However, the reference standard for normal radial nerves has not been established. Thus, this study measured the cross-sectional areas of radial nerves of 200 healthy male or female volunteers, aged 18 to 75, using high-resolution ultrasound. The results showed that mean cross-sectional areas of radial nerves at 4 cm upon the lateral epicondyle of the humerus and mid-humerus (midpoint between the elbow crease and axilla) were 5.14 ± 1.24 and 5.08 ± 1.23 mm(2), respectively. The age and the dominant side did not affect the results, but the above-mentioned cross-sectional areas were larger in males (5.31 ± 1.25 and 5.19 ± 1.23 mm(2)) than in females (4.93 ± 1.21 and 4.93 ± 1.23 mm(2), respectively). In addition, the cross-sectional areas of radial nerves were positively correlated with height and weight (r = 0.38, 0.36, respectively, both P < 0.05). These data provide basic clinical data for the use of high-resolution ultrasound for the future diagnosis, treatment, and prognostic evaluation of peripheral neuropathies.
authors.affiliation: Department of Neurology, Affiliated Hospital of Guiyang Medical College, Guiyang, Guizhou Province, China ; Lianshui County Hospital of Jiangsu Proviuce, Huaian, Jiangsu Province, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Neurology, Affiliated Hospital of Guiyang Medical College, Guiyang, Guizhou Province, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Wu
authors.affiliation: Pharmacology University of Wyoming College of Health Sciences, Wyoming INBRE Program, Laramie, WY, USA.
authors.forename: Jun
authors.initials: J
authors.lastname: Ren
keywords: cross-sectional area; high-resolution ultrasound; nerve lesion; nerve regeneration; neural regeneration; peripheral nerve; radial nerve