Herniated nucleus pulposus (HNP), also referred to as a herniated disc, is a common spine pathology that occurs approximately 95% of the time at the L4-L5 or L5-S1 level (Fisher et al., 2004; Asch ...
A review of her MRI scan revealed a large herniated disc at the L5-S1 level on the right, compressing the right S1 nerve root (Figs 8, 9). MD underwent an L5-S1 right microdiscectomy for excision ...