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

Upon presentation, her back pain had nearly resolved ... A review of her MRI scan revealed a large herniated disc at the L5-S1 level on the right, compressing the right S1 nerve root (Figs ...

The lumbar spine related hamstring is considered to be an injury that presents clinically as ... of a hypertrophied lumbosacral ligament is more clinically significant in older athletes with the ...

At the L5/S1 level, 58% were found to have an element of disc displacement ... A more detailed follow up study should be considered to investigate which particular training activities have the most ...

The U.S. Food and Drug Administration (FDA) has granted 510 (k) clearance to an expandable lateral lumbar interbody system.