==Report==
Although classification systems exist,<ref group="notes">Anterolisthesis is classified by degree of the slippage, as measured as percentage of the 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%
Reference: {{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> the most important parameter is the percentage of slippage as compared to the depth of the vertebral body.
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