Clinical efficacy of AUSS/UNSES-TLIF in the treatment of single-segment degenerative lumbar spinal stenosis: a retrospective study.

objectiveTo explore the clinical efficacy and advantages of Arthroscopic-assisted Uni-portal Spinal Surgery (AUSS)-Transforaminal Lumbar Interbody Fusion (TLIF) in the treatment of degenerative lumbar spinal stenosis (LSS).

methodsThis study included 71 patients with lumbar spinal stenosis who underwent surgical treatment at the Department of Spine Surgery, Second Affiliated Hospital of Xi'an Medical University, between January 2022 and December 2023. Among these, 34 patients underwent AUSS-TLIF surgery, and 37 patients underwent minimally invasive TLIF (MIS-TLIF) surgery. Preoperative and postoperative Visual Analog Scale (VAS) scores for low back and leg pain, Oswestry Disability Index (ODI) scores, intervertebral disc height, anterior-posterior diameter of the canal (APDC), surgical-related parameters (such as operative time, intraoperative blood loss, postoperative drainage, postoperative C-reactive protein levels, and length of hospital stay), and surgical outcomes were compared and analyzed between the AUSS-TLIF and MIS-TLIF groups.

resultsAll 71 patients were followed up. There were no significant differences in preoperative VAS scores or ODI index between the AUSS-TLIF and MIS-TLIF groups (P > 0.05). Three days postoperatively, both groups showed significant reductions in back and leg symptoms, with VAS scores significantly lower than preoperatively (P < 0.05). However, the AUSS-TLIF group had lower VAS scores at 3 days and 3 months postoperatively compared to the MIS-TLIF group, with a statistically significant difference (P < 0.05). At 12 months postoperatively, there was no significant difference in VAS scores between the two groups (P > 0.05). Both groups showed significant improvement in lumbar function at 3 and 12 months postoperatively, with ODI scores significantly lower than preoperatively (P < 0.05). However, the AUSS-TLIF group had a significantly lower ODI score at 3 months postoperatively compared to the MIS-TLIF group (P < 0.05), with no significant difference at 12 months (P > 0.05). There were no significant differences in preoperative intervertebral disc height or APDC between the two groups (P > 0.05). CT scans at 12 months postoperatively showed a significant increase in intervertebral disc height and APDC in both groups compared to preoperative values (P < 0.05), with no significant difference between the groups (P > 0.05). The AUSS-TLIF group had lower surgical blood loss, postoperative drainage, and postoperative inflammatory markers compared to the MIS-TLIF group (P < 0.05), but the AUSS-TLIF group had a significantly longer operative time compared to the MIS-TLIF group (P < 0.05).

conclusionBoth AUSS-TLIF and MIS-TLIF achieve good clinical outcomes, but AUSS-TLIF, as an endoscopic surgery with an open surgical concept, offers advantages including greater flexibility, smaller trauma, less blood loss, shorter operative time, and shorter hospital stay. It provides a better perioperative experience for patients.