Oblique lateral interbody fusion for lumbosacral fractional curve correction in degenerative lumbar scoliosis

Purpose: In combined anterior-posterior adult spinal deformity surgery, the optimal combination of anterior and posterior procedures remains unclear. We aimed to demonstrate the radiological outcomes and relevant factors in oblique lateral interbody fusion (OLIF) for lumbosacral fractional curve (FC) correction combined with open posterior surgery in degenerative lumbar scoliosis (DLS). Methods: This study involved 42 consecutive patients with DLS who had a major curve (MC) >= 20 degrees and an FC (L4 to S1) >= 10 degrees, and underwent a combined anterior-posterior surgery Changes in the MC, FC, coronal balance distance, type of coronal imbalance, coronal/sagittal disc angle at L4-5 and L5-S1, L4 and L5 tilt, and sagittal parameters were examined. The associations between FC correction and demographic, surgical, and radiological factors were analysed. Results: The FC decreased from 16.9 +/- 7.3 degrees preoperatively to 6.6 +/- 4.4 degrees at the last follow-up (P < 0.001). The coronal disc angle at L4-5 and L5-S1 were, respectively, 6.8 +/- 2.2 degrees and 6.0 +/- 4.1 degrees preoperatively and decreased to 2.2 +/- 2.1 and 1.2 +/- 1.3 degrees at the last follow-up (both P < 0.001). The changes in FC were greater in uppermost instrumented level > T10 (P < 0.001), and associated with the preoperative FC (r = 0.820, P < 0.001), L4 tilt (r = 0.434, P = 0.007), and L5 tilt (r = 0.462, P = 0.003). Conclusion: OLIF at the FC combined with open posterior surgery is an effective combined anterior-posterior correction strategy in DLS.