Yamamoto T, Yagi M, Suzuki S, et al. - A retrospective case series.was conducted to correlate the usefulness and cost-effectiveness of multilevel lateral interbody fusion (LIF) combined with posterior spinal fusion (PSF) (L group) and conventional PSF (with transforaminal lumbar interbody fusion) (P group) in adult spinal deformity (ASD) surgery. Researchers conducted a retrospective comparison of 88 surgically treated ASD patients with a minimum 2-year follow-up from a multicenter database (L group [n = 39] and P group [n = 49]). They further examined demographic and radiographic data, health-related quality of life, and the direct hospitalization cost for the initial surgery and 2-year total hospitalization cost. In comparison with conventional PSF, LIF with PSF is a similarly effective surgery for ASD. Nevertheless, further studies on the cost-effectiveness of LIF in different ASD patient cohorts are needed due to the significantly higher cost.