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A Method of Radial Nerve Length Measurement Based on Cadaveric Investigation.

Abstract：

OBJECTIVE:To determine the most reliable method to measure the length of the radial nerve during a nerve conduction study (NCS). DESIGN:Cadaveric investigation. SETTING:A practical anatomy research laboratory in a university. PARTICIPANTS:Fresh cadavers (N=10), with 1 cadaver for study design and 9 for data. INTERVENTIONS:Design of measurement methods using cadaver dissection and comparison of the measured values to the true length in 18 arms of 9 cadavers. MAIN OUTCOME MEASURES:Four points (A, B, C, D) were determined: (A) proximal stimulation point in NCS; (B) point at the elbow crease; (C) point in the midforearm; and (D) distal stimulation point 5cm above the extensor indicis. The true length of the radial nerve between the stimulus points (points A and D) in NCS was compared with the measured values by summation of the straight line segments between those points with various combinations. The difference in root mean square error (RMSE) of the distance measured by each method compared with the true length was calculated to determine the best measurement method. RESULTS:The closest distance to the true length (28.7±2.8cm) in the cadaveric investigation was obtained using the summation of straight line segments between points A, B, and D (A-B-D, RMSE=.72cm), followed by the A-B-C-D distance (RMSE=.87cm) and the A-D distance (RMSE=1.38cm) methods, in sequence. The former 2 distance measurements were relatively closer to the true length than the latter measurement method. CONCLUSIONS:Multiple segmentation measurement methods reflected the course of the radial nerve better than a single linear measurement method. We suggest that the distance measured using a stopover point near the lateral epicondyle between 2 stimulus points (A-B-D distance) is closer to the true length of the nerve.

journal_name

Arch Phys Med Rehabil

journal_title

Archives of physical medicine and rehabilitation

authors

Kim JG,Kim D,Seok HY,Kim Y,Yang KS,Rhyu IJ,Kim BJ

doi

10.1016/j.apmr.2016.08.464

subject

Has Abstract

pub_date

2017-03-01 00:00:00

pages

596-599

issue

eissn

0003-9993

issn

1532-821X

pii

S0003-9993(16)30956-X

journal_volume

pub_type

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A Method of Radial Nerve Length Measurement Based on Cadaveric Investigation.