Pure dislocation (without associated fracture) does not occur in the Lumbar spine because:
|A||The bodies of the lumbar vertebrae are stout|
|B||The facets of the lumbar vertebrae are stout and vertically placed|
|C||The ligamentum flavum in the lumbar region is well developed|
|D||The disc in the lumbar region is so thick it does not allow the bone to dislocate|
The facets of the lumbar vertebrae are stout and vertically placed
Dislocations are common in the cervical spine because of the horizon tally placed facets, the opposite applies to the lumbar spine where the vertically placed facets prevent any horizontal movement.