• Dean Chou, Gregory Mundis, Michael Wang, Kai-Ming Fu, Christopher Shaffrey, David Okonkwo, Adam Kanter, Robert Eastlack, Stacie Nguyen, Vedat Deviren, Juan Uribe, Richard Fessler, Pierce Nunley, Neel Anand, Paul Park, Praveen Mummaneni, and International Spine Study Group.
• Department of Neurosurgery, University of California San Francisco, San Francisco, California, USA. Electronic address: dean.chou@ucsf.edu.
• World Neurosurg. 2019 Jul 1; 127: e649-e655.

ObjectiveTo compare circumferential minimally invasive (cMIS) versus open surgeries for mild-to-moderate adult spinal deformity (ASD) with regard to intensive care unit (ICU) and hospital lengths of stay (LOS).MethodsA retrospective review of 2 multicenter ASD databases with 426 ASD (sagittal vertical axis <6 cm) surgery patients with 4 or more fusion levels and 2-year follow-up was conducted. ICU stay, LOS, and estimated blood loss (EBL) were compared between open and cMIS surgeries.ResultsPropensity matching resulted in 88 patients (44 cMIS, 44 open). cMIS were older (61 vs. 53 years, P = 0.005). Mean levels fused were 6.5 in cMIS and 7.1 in open (P = 0.368). Preoperative lordosis was higher in open than in cMIS (42.7° vs. 40.9°, P = 0.016), and preoperative visual analog score back pain was greater in open than in cMIS (7 vs. 6.2, P = 0.033). Preoperative and postoperative spinopelvic parameters and coronal Cobb angles were not different. EBL was 534 cc in cMIS and 1211 cc in open (P < 0.001). Transfusions were less in cMIS (27.3% vs. 70.5%, P < 0.001). ICU stay was 0.6 days for cMIS and 1.2 days for open (P = 0.009). Hospital LOS was 7.9 days for cMIS versus 9.6 for open (P = 0.804).ConclusionsFor patients with mild-to-moderate ASD, cMIS surgery had a significantly lower EBL and shorter ICU stay. Major and minor complication rates were lower in cMIS patients than open patients. Overall LOS was shorter in cMIS patients, but did not reach statistical significance.Copyright © 2019 Elsevier Inc. All rights reserved.

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