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

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 ...

Many clinicians subscribe to the concept of a “back related” hamstring injury (or more specifically lumbar spine related), 3– 5 although this is a controversial ... athletes with the common finding of ...

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 ...