RT Journal Article SR Electronic A1 Nierengarten, Mary Beth T1 Position of Pedicle Screws during Lumbar Fusion Surgery Significant in Reducing Complications JF MD Conference Express YR 2015 FD SAGE Publications VO 14 IS 50 SP 17 OP 17 DO 10.1177/155989771450014 UL http://mdc.sagepub.com/content/14/50/17.abstract AB This article presents the results of a prospective comparative study—Effect of Superior Adjacent Segment Degeneration after Lumbar Posterolateral Fusion Using Two Different Pedicle Screw Insertion Positions With Nine-Year Minimum Follow-Up—of patients with low-grade isthmic spondylolisthesis, which assessed the effect of different pedicle screw insertion positions on adjacent segment degeneration.