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目的：为腰骶部脊神经根解剖变异的临床手术提供参考。方法：术中观察腰骶部脊神经根解剖变异情况。结果：在临床１２４０例选择性脊神经后根切断术中发现１５例双根脊神经共干，共硬脊膜鞘变异。变异率为１．２１％。此类变异有一定的类同性和有一定的规律：共干的双脊神经在共硬脊膜鞘前有约１．５～２．０ｃｍ段被蛛网膜共同包绕，近脊髓神经根部及前、后干为游离状态。脊神经的前、后根结合部无交叉联系，可钝性分离。变异侧神经出口少于对侧，前根和后根的直径比值为１．２±０．４０．６±０．８ｍｍ。结论：了解和认识腰骶部脊神经根变异特点，对ＳＰＲ手术及腰骶部脊神经部位的手术有重要的参考价值。
Objective: To provide reference for the clinical operation of lumbosacral spinal nerve root anatomic variation. Methods: Anatomical variation of the nerve root of lumbosacral spine was observed intraoperatively. Results: In 1240 cases of selective posterior rhizotomy of the spinal nerve, 15 cases of double root spinal nerve co-stem were found. The mutation rate was 1.21%. Such mutations have certain similarities and have certain laws: a total of double spinal nerve in a total spinal dural sheath about 1.5 ~ 2.0cm section was co-wrapped around the arachnoid, near the spinal cord roots and the former, After dry for the free state. Spinal nerve before and after the junction of the Ministry of no cross-linked, can be blunt separation. Variant side of the nerve outlet less than the contralateral, anterior and posterior root diameter ratio of 1.2 ± 0.40.6 ± 0.8mm. Conclusion: Understanding and understanding of the characteristics of lumbosacral spinal nerve root variation, the SPR operation and lumbosacral spinal nerve site surgery has important reference value.