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J Korean Assoc EMG Electrodiagn Med 2008;10(1):18-21.
Published online June 1, 2008.
Width of A Tapeline Influences on Measurement of Across Elbow Segment in Ulnar Motor Conduction Study
Abstract
Objectives: We sometimes experience that a tapeline is partially folded in fully flexed elbow position,which may cause a considerable error in the measurement of across-elbow conduction velocity. Thisstudy is purposed to demonstrate the difference in distance measure of AE segment according to differentwidths of tapeline.Methods: We performed ulnar motor segmental conduction study with standard technique in twentyhealthy subjects (average 29.8±6.35 years, male:female=13:7). Distance of AE segment was measuredwith three different widths (5 mm, 10 mm, 15 mm) of tapeline at two different elbow positions (90 degreeand 135 degree of elbow flexion) by two separate examiners.Results: In 90 degree of elbow-flexion, distances of AE segment were 10.4±0.29, 10.7±0.34, and 10.9±0.31 cm with 5-, 10- and 15 mm-width tapeline, which were significantly different (p<0.05). In 135degree of elbow-flexion, distances of AE segment were 10.7±0.43, 11.0±0.45, and 11.4±0.53 cm with5-, 10- and 15 mm-width tapeline, which were also significantly different (p<0.05).Conclusion: There is a room for considerable error (5~6%) in the measurement of AE conduction velocityaccording to width of a tapeline. Therefore width of a tapeline also should be considered for establishmentof normative data in segmental ulnar motor conduction study.
Key Words: Ulnar nerve, Conduction study, Elbow position, Tapeline
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