A New Electrophysiological Method for the Diagnosis of Extraforaminal Stenosis at L5?S1

Hiroshi Iwasaki; Munehito Yoshida; Hiroshi Yamada; Hiroshi Hashizume; Akihito Minamide; Yukihiro Nakagawa; Masaki Kawai; Shunji Tsutsui

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자료유형: 학술저널

저자정보: Hiroshi Iwasaki (Wakayama Medical University) Munehito Yoshida (Wakayama Medical University) Hiroshi Yamada (Wakayama Medical University) Hiroshi Hashizume (Wakayama Medical University) Akihito Minamide (Wakayama Medical University) Yukihiro Nakagawa (Wakayama Medical University) Masaki Kawai (Wakayama Medical University) Shunji Tsutsui (Wakayama Medical University)

저널정보: 대한척추외과학회 Asian Spine Journal Asian Spine Journal Vol.8 No.2

발행연도: 2014.4

수록면: 145 - 149 (5page)

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Study Design: A retrospective study. Purpose: To examine the effectiveness of using an electrodiagnostic technique as a new approach in the clinical diagnosis of extraforaminal stenosis at L5?S1. Overview of Literature: We introduced a new effective approach to the diagnosis of extraforaminal stenosis at the lumbosacral junction using the existing electrophysiological evaluation technique. Methods: A consecutive series of 124 patients with fifth lumbar radiculopathy were enrolled, comprising a group of 74 patients with spinal canal stenosis and a second group of 50 patients with extraforaminal stenosis at L5?S1. The technique involved inserting a pair of needle electrodes into the foraminal exit zone of the fifth lumbar spinal nerves, which were used to provide electrical stimulation. The compound muscle action potentials from each of the tibialis anterior muscles were recorded. Results: The distal motor latency (DML) of the potentials ranged from 11.2 to 24.6 milliseconds in patients with extraforaminal stenosis. In contrast, the DML in patients with spinal canal stenosis ranged from 10.0 to 17.2 milliseconds. After comparing the DML of each of the 2 groups and at the same time comparing the differences in DML between the affected and unaffected side of each patient, we concluded there were statistically significant differences (p <0.01) between the 2 groups. Using receiver operating characteristic curve analysis, the cutoff values were calculated to be 15.2 milliseconds and 1.1 milliseconds, respectively. Conclusions: This approach using a means of DML measurement enables us to identify and localize lesions, which offers an advantage in diagnosing extraforaminal stenosis at L5?S1.

#Diagnosis #Evoked potencials #Spinal stenosis #Diagnostic techniques and procedures #Far-out syndrome

참고문헌 (11)

참고문헌 신청

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