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==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=={{reflistBottom}}
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|author1=[[User:Mikael Häggström|Mikael Häggström]]
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===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="notenotes">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>
Anterolisthesis is classified by degree of the slippage, as measured as percentage of the width of the vertebral body:<ref>{{cite web|url=http://www.massgeneral.org/ortho-childrens/conditions-treatments/spondylolysis.aspx|title=Spondylolysis and Spondylolisthesis of the Lumbar Spine|website=Massachusetts General Hospital|accessdate=2016-12-14}}</ref>
*Grade V: greater than 100%
