Authors: Takao Murohashi Mitsunori Yoshimoto Tsuneo Takebayashi Shuichi Hashimoto Shouto Yamada Hiroyuki Takashima Toshihiko Yamashita
Publish Date: 2016/09/09
Volume: 26, Issue: 2, Pages: 434-440
Abstract
The measurement of distal motor latency DML is an established method for diagnosing entrapment peripheral neuropathy DML can also serve as an index for disease severity and prognosis We considered that measuring DML could be useful in estimating the severity of spinal root impairment and predicting prognosis in patients with lumbar spinal stenosis LSS The purpose of this study was to investigate the efficacy of intraoperative direct electrical stimulation of the spinal root and the measurement of DML in LSSIn 39 patients with LSS a total of 93 spinal roots were stimulated and evoked electromyography was recorded at the leg muscles after decompression DML was measured and its correlation with clinical severity as evaluated by Zurich claudication questionnaire ZCQ and Short Form 36 SF36 was investigatedFor the stimulation of the L3 L4 and L5 spinal root the mean DML ms were 68 ±14 74 ±13 and 60 ±13 in gluteus medius 93 ±15 92 ±15 and 90 ±16 in biceps femoris 97 ±10 98 ±18 and 94 ±12 in vastus medialis 161 ±10 147 ±13 and 141 ±15 in tibialis anterior and 164 ±14 143 ±18 and 139 ±19 in gastrocnemius muscles Statistically significant positive correlations were observed between DML and height Preoperative symptom and function scores of ZCQ and postoperative bodily pain scores of SF36 were significantly worse in the patients with prolonged DML
Keywords: