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

Or have you had a sudden numbness or pins-and-needles sensation in your legs or feet that you can’t explain?These are not ...

The lumbosacral plexus is formed by the ventral branches of the second to fifth lumbar nerves. The lower division of the fourth lumbar nerve joins the fifth, and the lumbosacral trunk thus formed ...

Objectives: To observe the prevalence of lumbar intervertebral disc degeneration in elite athletes ... It was most common at the L5/S1 level, and, of the abnormal group, 36% (n = 11) showed the most ...