Greater than 100 percent anterior translation corresponds to Meyerding grade what?

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The concept tested is how Meyerding grades spondylolisthesis by how far the upper vertebra has slid forward relative to the one below, expressed as a percentage of the width of the lower vertebral body. In this system the slips range from grade one up to grade four for increasing amounts of forward displacement, with grade five representing more than one hundred percent translation—where the upper vertebra has slipped completely past the lower one, known as spondyloptosis. Therefore, greater than one hundred percent anterior translation corresponds to grade five.