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 ...

Ten (10) specimens had the cone at level L3, 5 at level L4, 4 at level S1, 3 at level L5, and 1 each at levels L2 and S2. The Fisher’s test resulted in no statistical differences (p = 0.2445) for the ...