最简单的解释是腰麻时硬膜外针未在硬膜外间隙。
The simplest explanation is that the epidural needle is not actually in the epidural space at the time of attempted spinal puncture.
游离的髓核移位至后方硬膜外间隙是非常少见的。
Epidural migration of a sequestrated disc to posterior epidural space is rare.
结果：腰骶部脊神经根在硬膜外间隙长度短，且显露困难。
Results: The length of lumbosacral nerve roots in epidural space is short and extremely difficult to be exposed.
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