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目的 :明确L3～ 4 、L4～ 5、L5～S1椎间盘与硬膜囊、神经根和脊神经前支的距离。方法 :在 2 0 0例腰椎正常CT片和 2 1具成人腰椎标本上分别观测了L4 、L5、S1神经根出硬膜囊的水平及L3～ 4 、L4～ 5、L5～S1椎间盘与硬膜囊、神经根和脊神经前支的距离。结果 :L3～ 4 椎间盘与硬膜囊及L4～ 5椎间盘与硬膜囊和L5神经根关系密切 ,L5～S1椎间盘与硬膜囊和S1神经根相隔一定距离 ,L3～ 4 、L4～ 5、L5～S1椎间盘与其外后方脊神经前支的距离递减。结论 :L3～ 4 椎间盘突出易压迫硬膜囊 ,L4～ 5椎间盘突出易压迫硬膜囊和L5神经根 ,L3～ 4 、L4～ 5、L5～S1椎间盘的椎间孔外侧型突出 ,压迫脊神经前支的机会递增。
OBJECTIVE: To determine the distance between L3 ~ 4, L4 ~ 5, L5 ~ S1 intervertebral discs and dural sac, nerve root and anterior branch of spinal nerve. Methods: The levels of L4, L5 and S1 nerve root dural sac and the thickness of L3 ~ 4, L4 ~ 5, L5 ~ S1 intervertebral discs and hard Membrane sac, nerve root and spinal nerve anterior branch distance. Results: There was a close relationship between L3 ~ 4 intervertebral disc and dural sac, L4 ~ 5 intervertebral disc and dural nerve root and L5 nerve root. L5 ~ S1 intervertebral disc was separated from dural sac and S1 nerve root by L3 ~ 4, L4 ~ 5, The distance between L5 ~ S1 disc and its posterior branch of posterior spinal cord decreased. Conclusion: The L3 ~ 4 disc herniation is easy to compress the dural sac. The L4 ~ 5 disc herniation is easy to compress the dural sac and the L5 nerve root. The L3-4, L4-5 and L5 ~ S1 intervertebral foramen protrude out of the intervertebral foramen, The former branch of the opportunity to increase.