Lumbosacral ligament

The lumbosacral ligament or lateral lumbosacral ligament is a ligament that helps to stabilise the lumbosacral joint. The ligament's medial attachment is at transverse process of lumbar vertebra L5; its lateral attachment is at the ala of sacrum.
The lumbosacral ligament extends obliquely inferior-ward from its medial attachment. Superiorly, it is partially continuous with the inferior margin of the iliolumbar ligament.

Research

According to a cadaveric study, the lumbosacral ligament forms a roof of a lumbosacral tunnel which is traversed by the lumbar spinal nerve L5; the tunnel may be the site of extraforaminal nerve entrapment due to mass effect of local pathologies.