Assertion: degenerative spondylolisthesis | /r/DistinctFrom | its isthmic counterpart
Facets:
Source sentences:
text: Degenerative spondylolisthesis occurs mostly at the L4-L5 (fourth and fifth lumbar vertebrae) level as opposed to its isthmic counterpart, which occurs most often at the lumbosacral level (L5-S1).