From radlines.org
Jump to: navigation, search

Author: Mikael Häggström [notes 1]

Spondylolisthesis measurement on X-ray, 25% in this example.

Spondylolisthesis includes anterolisthesis (anterior displacement of a vertebra over the vertebra inferior to it (or the sacrum).) and retrolisthesis (posterior displacement).[notes 2]


Although classification systems exist,[1]

  • Grade I: 0-25%
  • Grade II: 25- 50%
  • Grade III: 50-75%
  • 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.


  1. For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Radlines:Authorship for details.
  2. Spondylolisthesis is sometimes defined as anterior displacement specifically, see for example Spondylolisthesis terminology in Wikipedia for details.


  1. . Spondylolysis and Spondylolisthesis of the Lumbar Spine. Massachusetts General Hospital. Retrieved on 2016-12-14.