Abstract:Objective To study clinical effect of robot-assisted oblique lateral interbody fusion (RAOLIF) and internal fixation in single position or reposition surgery. Methods Twelve patients underwent single position RAOLIF surgery operated by the same surgeon from July 2018 to September 2021 were retrospectively collected.The patients included four males and eight females aging (59.17±8.72) years.Twenty-four patients with matched age,gender,body mass index (BMI) and surgical segment were included in robot-reposition RAOLIF group.The patients were (59.50±7.76) years old.There were eight males and sixteen females.BMI,operation segments,operative time,intraoperative blood loss,times of radiations,length of postoperative hospital stay and unplanned secondary surgery were collected.Radiology parameters as disc height of upper segment,lumbar lordosis angle,foraminal height of surgical segment,facet joint invasions,screw deviation distance and screw breach grade were measured and analyzed.Screw acceptable rate was calculated.Results There was no difference between two groups in operation time,blood loss,postoperative hospital stay,disc height of upper segment,lumbar lordosis angle,and intervertebral foramen height (P>0.05).Number of radiation times in single position group was lower than reposition group (P=0.038).After surgery,foraminal height of surgical segment was increased in both groups (P<0.01).Screw accessibility rate was 98% in single group and 97% in reposition group. Conclusion RAOLIF surgery in single position has the same safety and accuracy as reposition surgery.It could reduce the surgical radiation and improve foraminal height,though could not decrease the operation time and blood loss.