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目的：探讨脑性瘫痪儿童腰骶脊髓Ｉα背根兴奋性与肌肉痉挛的关系。方法：在１２例患儿选择性脊神经背根切断术中，直接电刺激Ｌ２～Ｓ１节段的４０８条Ｉα背根小束，观察其兴奋阈值和传导潜伏期等值的改变，并比较５例患儿１３条背根的术后电生理变化。结果：各节段脊小束兴奋阈高低不均，但传导潜伏期值在正常范围。术后残余Ｉα背根的兴奋阈明显提高（Ｐ＜０．０５），其它电生理值无改变（Ｐ＞０．０５）。结论：脑瘫患儿脊髓ｒ－环路的外周传入不均衡；手术通过减少Ｉα背根传入纤维的异常兴奋性而缓解肌痉挛
Objective: To investigate the relationship between Iα dorsal root excitability and muscle spasm in lumbosacral spinal cord in children with cerebral palsy. Methods: A total of 408 Iα dorsal root bundles in L2 ~ S1 segments were directly stimulated by selective dorsal root ganglion in 12 patients. The excitatory thresholds and conduction latency were observed. Five patients Electrophysiological changes in 13 children with dorsal root. Results: The excitatory threshold of each segment ridge was uneven, but the conduction latency value was within the normal range. Excitatory thresholds of residual Iα dorsal root were significantly increased (P <0.05) and no changes of other electrophysiological values (P> 0.05). Conclusions: Peripheral afferent r-loops in children with cerebral palsy are not evenly distributed. Surgery relieves muscle spasms by reducing the abnormal excitability of Iα dorsal root afferent fibers