1611. Is there a difference in early outcomes between stand-alone lateral lumbar interbody fusions versus lateral lumbar interbody fusions with posterior supplemental fixation?

Authors: Sohrab Virk; Avani Vaishnav, MBBS; Steven McAnany, MD; Todd Albert, MD; Sravisht Iyer, MD; Catherine Himo Gang, MPH; Sheeraz Qureshi, MD, MBA (New York, NY)

Introduction: The aim of this study was to find the difference in short term outcomes for patients undergoing lateral interbody fusion (LLIF) with or without posterior supplemental fixation. Methods: We performed a retrospective review of patients treated with a LLIF procedure between 2017-2018. We tracked patients for the need for revision surgery during short term follow up. Radiographs and cross-sectional imaging were examined for pre-operative, immediate post-operative and final neuroforaminal height. A student’s t-test was used to compare values from the stand-alone cohort and the cohort of patients with supplemental posterior fixation. Results: There were 29 patients that met our inclusion criteria. There were 12 patients in the stand-alone LLIF (SA-LLIF) cohort and 17 patients in the LLIF with posterior fixation cohort (LLIF-PF). The average age and BMI for the SA-LLIF was 61.8 +/- 12.9 years and 26.5 +/- 2.9 kg/m^2 respectively. The average and BMI for the LLIF-PF cohort was 58.6 +/- 2.4 years and 29.1 +/- 5.9 kg/m^2 respectively. The average follow-up was 5.1+/- 2.8 months. In both groups there was a statistically significant increase in neuroforaminal height between pre-operative and final measurements (SA-LLIF – 16.7 +/- 3.5 to 20.1 +/- 4.4 mm, p < 0.001 and LLIF-PF – 14.7 +/- 2.9 to 17.9 +/- 4.3 mm, p < 0.001). There was a statistically significant decrease in VAS back (6.1 +/- 2.5 versus 3.6 +/- 2.3, p = 0.007) and leg scores (5.3 +/- 2.8 versus 3.1 +/- 2.4, p = 0.04) in the SA-LLIF cohort. Conclusion: Stand-alone LLIF constructs is a viable treatment option for patients with back/leg pain from symptomatic disc herniations or degeneration. In this series of patients with short term follow up, stand alone constructs perform equivalently to patients with LLIF and posterior fixation.