Topping-off Surgery Transforaminal Lumbar Intervertebral Fusion for Combined One-level Spondylolisthesis and Adjacent Lumbar Disc Herniation: A Comparative Study of Clinical Efficacy and Radiographic Outcomes With a Two-year Follow-up.

BACKGROUND/AIM: To investigate the radiographic and clinical outcomes in patients diagnosed with multilevel lumbar spine degeneration, undergoing hybrid stabilization with an interspinous device (IPD) adjacent to spine fusion, as compared with those experiencing three-segment or two-segment transforaminal lumbar interbody fusion (TLIF) via minimally invasive surgery (MIS).

PATIENTS AND METHODS

Between 2015-2017, 51 consecutive patients who received three-segment TLIF, interspinous dynamic stabilization combined with two-segment TLIF (topping-off surgery), and two-segment TLIF coupled with adjacent level lumbar discectomy (two-segment TLIF+discectomy) were studied. These three operative procedures were performed by one neurosurgeon at the same hospital. Post-operative analysis of the two-year analysis was conducted by another neurosurgeon. Radiographic and clinical outcomes were compared among the three groups.

RESULTS

Duration of surgery was significantly shorter in the topping-off surgery and TLIF+discectomy compared to three-segment TLIF group. Although there was no difference in hospital stay among the three groups, visual analogue scale (VAS) and Oswestry disability index (ODI) were less in the topping-off group than in the three-segment TLIF or two-segment TLIF+discectomy groups after one week and three months follow-up, respectively. Disc high index (DHI) in adjacent segment decreased from before the operation to two years follow-up postoperatively in the two-segment TLIF+discectomy group. In contrast, DHI in the segment adjacent to spondylolisthesis increased from before the operation to last follow-up post-operatively in the three-segment TLIF group. Compared with the two-segment TLIF+discectomy group, the topping-off group showed higher foramen high index at the IPD level. While there was no difference in segment range of motion among the three groups, the topping-off group showed preserved total range of motion at a two-year follow-up, as compared with the three-segment TLIF group.

CONCLUSION

Under strict indications, topping-off surgery is an acceptable alternative to fusion surgery for spondylolisthesis combined with adjacent disc degeneration.