Subramony S H, Wilbourn A J
Arch Phys Med Rehabil. 1981 Nov;62(11):590-2.
A patient with grade II spondylolisthesis and back pain underwent Harrington rod instrumentation. Postoperatively, he developed pain and numbness of the lateral aspect of the left foot and loss of the left AChilles reflex. Preoperative electrodiagnostic findings of the left lower extremity were normal. Two postoperative studies revealed that, concomitant with evidence of denervation if the left S1-supplied muscles, his sural sensory nerve action potential (SNAP) had been abolished but the superficial peroneal SNAP, recorded from the intermediate branch, was normal and equal to that of the contralateral foot. Though various dermatomal maps show this branch to be in the border zone between S1 and L5 dermatomes, the findings in this patient are evidence that the SNAP of the superficial peroneal nerve, recorded as described, is subserved by fibers in the L5 root. In lesions producing axonal loss in L5 root distribution, the amplitude of the superficial peroneal SNAP will be of value in distinguishing lesions at or distal to the dorsal root ganglion from those proximal to it.
一名患有II级腰椎滑脱症且伴有背痛的患者接受了哈灵顿棒内固定术。术后，他出现了左脚外侧疼痛和麻木，以及左侧跟腱反射消失。术前左下肢的电诊断结果正常。两项术后研究显示，在有证据表明左侧S1支配的肌肉出现失神经支配的同时，他的腓肠感觉神经动作电位（SNAP）消失，但从中间支记录的腓浅神经SNAP正常，且与对侧足部的相同。尽管各种皮节图显示该分支位于S1和L5皮节的边界区域，但该患者的发现证明，按所述记录的腓浅神经SNAP由L5神经根中的纤维提供。在导致L5神经根分布区轴突损失的病变中，腓浅神经SNAP的波幅对于区分背根神经节处或其远端的病变与近端病变具有重要价值。
