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'''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"/>
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=GradingMassachusetts General Hospital|accessdate==={{Spondylolisthesis grades2016-12-14}}</ref>*Grade I: 0-25%*Grade II: 25- 50%*Grade III: 50-75%*Grade IV: 75-100%*Grade V: greater than 100%
==Notes==
