A grade 3 anterolisthesis would be how much anterior translation?

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Grading anterolisthesis uses how far the upper vertebra has slipped forward as a percentage of the width of the lower vertebral body. This measurement on imaging places the slip into ranges that guide severity. A grade three slip corresponds to about 50% to 75% anterior translation, meaning the upper vertebra has moved forward more than half but less than three-quarters of the width of the lower vertebra. That’s why the best choice is the 50-75% range. In comparison, 0-25% is mild, 25-50% is moderate, and 75-100% is quite severe, with >100% considered spondyloptosis.