L5-S1 is the exact spot where the lumbar spine ends and the sacral spine begins. The lumbosacral joint connects these bones.

Lower back pain? You may have heard your practitioner mention something about your L4-L5 spinal segment. The lower back ...

Thus, a left L5-S1 disc herniation compresses the left S1 ... Although most recover without surgery, patients with large midline lumbar HNPs may suffer significant neurological impairment.

Objectives: To observe the prevalence of lumbar intervertebral disc degeneration in elite athletes as compared with published literature of changes seen in non-athletes—that is, normal population.

Along with back pain, over the next few days she began ... evidence of mild degenerative disc disease at the L4-L5 and L5-S1 interspace without significant compression of neural structures ...

After spaceflight, 47% and 33% of astronauts reported acute and chronic pain, respectively. They also experienced moderate to severe muscle hypertrophy in the lumbar multifidus, particularly in the L4 ...

They also experienced moderate to severe muscle hypertrophy in the lumbar multifidus, particularly in the L4-L5 and L5-S1 segments. In regard to other spinal changes, spaceflight was associated ...