Which direction of translation is most commonly described in spondylolisthesis?

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Forward, or anterior, translation is the movement most often described in spondylolisthesis. This condition typically involves a defect or stress injury in the pars interarticularis that allows the upper vertebral body to slip forward over the vertebra beneath it under the body’s weight and the forces of lumbar lordosis. On imaging, especially the lateral view, you commonly see the upper vertebral body displaced anteriorly relative to the lower one, which is the hallmark of the slip. This anterior displacement can be graded by how far the slip goes, helping quantify severity. Lateral slipping or side-to-side movement isn’t the usual pattern in this condition, and posterior or superior translation describes different, less typical scenarios (retrolisthesis or vertical migration) that aren’t the standard description for spondylolisthesis.