Science today isn't the same as the science 2000 years ago was but some principles remain the same. The human knowledge constantly grows but with more knowledge there comes even more mysteries and unsolved questions, so science is always going forward.
Causes. The most common cause of a cervical herniated nucleus pulposus is gradual degeneration of the disc, attenuation (weakening) of the posterior annulus fibrosis, and subsequent protrusion of the nucleus pulposus into the spinal canal causing compression of the nerve root.
L5/S1 herniated nucleus pulposus (HNP) is a type of spine degeneration situated between the lumbar spine in the lower back and the sacral spine segment in the pelvis.5/SI HNP and nerve compression can lead to a number of pain-related symptoms, including: 1  Local, chronic lower back pain. 2  Sciatic pain. 3  Muscle weakness or fatigue in the buttocks, legs and feet.