The authors of both studies have done a commendable job in helping us re-think our daily practice axioms. Still, not all degenerative spondylisthesis patients are the same, and there may have been benefit in assessing the loaded saggital segmental alignment preoperatively and differentiating results accordingly. A 3mm slip is a very minor grade 1 listhesis, and that might explain why no difference was found between the Swedish registry groups. I look forward to reading the results of the radiographic analysis when completed.
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