Effects of diferent pedicle screw insertion depths on sagittal balance of lumbar degenerative spondylolisthesis, a retrospective comparative study

Few reports to date have evaluated the efects of diferent pedicle screw insertion depths on sagittal balance and prognosis after posterior lumbar interbody and fusion (PLIF) in patients with lumbar degenerative spon‑ dylolisthesis (LDS). A total of 88 patients with single-level PLIF for LDS from January 2018 to December 2019 were enrolled. Long screw group (Group L): 52 patients underwent long pedicle screw fxation (the leading edge of the screw exceeded 80% of the anteroposterior diameter of vertebral body).