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5%) and at 11 levels within a mean of 9.2 years. Cox proportional hazard regression analysis indicated that the independent risk factors for reoperation were a sagittal rotation angle ≥10° (adjusted hazard ratio 5.17) and facet opening on CT (adjusted hazard ratio 4.82). Neither sagittal translation nor the ossification condition in the lumbar segments affected reoperations. A sagittal rotation angle ≥10° and facet opening on preoperative CT were risk factors for reoperation at the same level as that of the index surgery in patients wi
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