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 herniated disc. Your L4-L5 disc, in between the vertebrae is the most likely to herniate.When this happens, the inner ...