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Although classification systems exist,[notes 3] the most important parameter is the percentage of slippage as compared to the depth of the vertebral body.
- See also: General notes on reporting
- For a full list of contributors, see article Radlines:Authorship for details. . Creators of images are attributed at the image description pages, seen by clicking on the images. See
- Spondylolisthesis is sometimes defined as anterior displacement specifically, see for example Spondylolisthesis terminology in Wikipedia for details.
Anterolisthesis is classified by degree of the slippage, as measured as percentage of the depth of the vertebral body, mainly as follows:
- Grade I: 0-25%
- Grade II: 25- 50%
- Grade III: 50-75%
- Grade IV: 75-100%
- Grade V: greater than 100%