==Diseases=====Spondylolisthesis===[[File:SpondylolisthesisL5S1.jpg|thumb|Grade III anterolisthesis at the L5-S1 level.]]'''Spondylolisthesis''' includes '''anterolisthesis''' (anterior displacement of a vertebra over the vertebra inferior to it (or the [[sacrum]]).) and '''retrolisthesis''' (posterior displacement).<ref name="Terminology" group="note"/> ===Grading==={{AnterolisthesisSpondylolisthesis grades}} ==Notes=={{reflist|group="note"|refs=<ref name="Terminology" group="note">Spondylolisthesis is sometimes defined as anterior displacement specifically, see for example [https://en.wikipedia.org/wiki/Spondylolisthesis#Terminology Spondylolisthesis terminology] in Wikipedia for details.</ref>}} ==References=={{reflist}}