Which grade corresponds to 75-100% anterior translation?

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Grading anterior translation measures how far a vertebral body slips forward over the one below in spondylolisthesis, using the slip expressed as a percentage of the lower vertebra’s width. A forward slip of 75-100% means the upper vertebra has moved forward by three-quarters to essentially the full width of the lower one, which is classified as Grade 4. This level signals substantial displacement and instability, but not complete forward collapse, which would be Grade 5 (>100%). Lower grades correspond to smaller slips: Grade 3 is roughly 51-75%, Grade 2 about 26-50%, and Grade 1 about 0-25%.