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[[File:SpondylolisthesisL5S1Spondylolisthesis measurement on X-ray.jpgpng|thumb|Spondylolisthesis measurement on X-ray of 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="notes">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>
==Report==Although classification systems exist,<ref group="notes"Anterolisthesis is classified by degree of the slippage, as measured as percentage of the width depth of the vertebral body, mainly as follows:<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 I: 0-25%
*Grade II: 25- 50%
*Grade IV: 75-100%
*Grade V: greater than 100%
</ref> the most important parameter is the percentage of slippage as compared to the depth of the vertebral body.
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