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

Her primary care physician ordered a magnetic resonance imaging (MRI) scan of the lumbar spine and referred her ... disc disease at the L4-L5 and L5-S1 interspace without significant compression ...

Knowing a patient's symptoms helps radiologists in lumbar spine MRI interpretation and diagnosis, according to a study published today in Radiology, a journal of the Radiological Society of North ...