AIM: To investigate the changes of the muscular tension of their controlling muscular groups and myotatic reflex, as well as the effect of the sectional cross anastomosis on lower limb function after sectional cross anastomosis of the posterior branch of lumbar sacral spinal nerves. 目的:探讨对脑性瘫痪患者实施腰骶脊神经后根交叉吻合后,该脊神经后根支配肌群的肌张力和牵张反射的变化和对下肢功能的影响。