But in late stage, mechanical compression becomes the main course of sciatic pain, and remedial epidural dexamethasone therapy has no effect on PWMT.

• 当椎间盘突出到达一定阶段，压迫因素成为致痛的主因时，硬膜外再给予地塞米松对已经产生的痛阈降低没有明显的缓解作用。