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One patient (serial number 3, subtotal laminectomy [STL] group) had no preoperative spondylolisthesis but grade I spondylolisthesis is newly observed after surgery (From the left, preoperative, postoperative, 6 months, 1 year, 5 years later. In a separate, visual analogue scale [VAS] back and leg, Oswestry Disability Index [ODI] improved from 6, 7, 52 to 0, 0, 4, respectively at the last follow-up).
