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===Spondylolisthesis===<gallery>[[File:SpondylolisthesisL5S1Spondylolisthesis - crop.jpg|thumblink=Spondylolisthesis|Grade III anterolisthesis at the L5-S1 level.]]'''Spondylolisthesis''' includes '''anterolisthesis''' (anterior displacement of a vertebra over the vertebra inferior to it (or the [[sacrumSpondylolisthesis]]).) 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> Anterolisthesis is classified by degree of the slippage, as measured as percentage of the width of the vertebral body:<ref>{{cite web|url=httpFile://www.massgeneral.org/orthoX-childrens/conditionsray of scoliosis -treatments/spondylolysiscrop.aspxjpg|titlelink=Spondylolysis and Spondylolisthesis of the Lumbar SpineScoliosis|website=Massachusetts General Hospital|accessdate=2016-12-14}}[[Scoliosis]]</refgallery>*Grade I: 0-25%*Grade II: 25- 50%*Grade III: 50-75%*Grade IV: 75-100%*Grade V: greater than 100%
Organized
===Lumbar spine===
*[[Trauma of the lumbar spine]]
==Modalities==
<gallery>
File:Lumbarization of S1 (lateral view).jpg|thumb|link=X-ray of the vertebral column|'''X-ray''' of the vertebral column]]
</gallery>
==Diseases==
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