Medically reviewed by Brigid Dwyer, MD The lumbosacral joint, also called L5-S1, is a term used to describe a part of the ...

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., ...

Dr. Jeff Lehmen, a spine surgeon at SSM St. Mary's Hospital, said this assumption could be a sign of lumbar disk herniation, ...