The lumbosacral joint, also called L5-S1, is a term used to describe a part of the spine. L5-S1 is the exact spot where the lumbar spine ends and the sacral spine begins. The lumbosacral joint ...

It arises from an anatomical variation in the lower spine known as a lumbosacral transitional ... vertebra forms between the lumbar and sacral spine. This condition can cause lower back pain, but it ...