The major causes of the unusual relationship were sequestered disc displacement, extreme lateral lumbar disc extrusion, median or paramedian disc protrusions and sacralization of lumbar vertebra.

• 压迫下2个出口的神经根者占5.；9%25，主要原因为向下游离型椎间盘突出物的位移、中央或偏中央型椎间盘突出以及移行椎。