• Chee Kidd Chiu, Chan Chris Yin Wei CYW 1 Department of Orthopaedic Surgery, National Orthopaedic Centre of Excellence for Research and Learning, University of Malaya, Kuala Lumpur, Malay, Josephine Rebecca Chandren, Jun Yin Ong, Shweh Fern Loo, Mohd Shahnaz Hasan, and Mun Keong Kwan.
• 1 Department of Orthopaedic Surgery, National Orthopaedic Centre of Excellence for Research and Learning, University of Malaya, Kuala Lumpur, Malaysia.
• J Orthop Surg (Hong Kong). 2019 May 1; 27 (2): 2309499019839023.

ObjectiveThe aim of this study was to compare the outcome of after-hours electively planned Posterior Spinal Fusion surgeries for Adolescent Idiopathic Scoliosis (AIS) patients with daytime surgeries.MethodsThis was a retrospective propensity score-matched study using prospectively collected data. Surgeries performed between 08:00 and 16:59 h were labeled as daytime surgeries (group 1) and surgeries performed between 17:00 and 06:00 h were labeled as after-hours surgeries (group 2). The perioperative outcome parameters were average operation time in and out, operation duration, intraoperative blood loss, blood transfusion, intraoperative hemodynamic parameters, preoperative hemoglobin, postoperative hemoglobin, and total patient-controlled anesthesia (PCA) morphine usage. Radiological variables assessed were Lenke subtypes, preoperative Cobb angle, number of fusion levels, number of screws used, postoperative Cobb angle, correction rate, side bending flexibility, side bending correction index, complications rate, and length of hospitalization.ResultsAverage operation time in for daytime group was 11:32 ± 2:33 h versus 18:20 ± 1:05 h in after-hours group. Comparing daytime surgeries with after-hours surgeries, there were no significant differences ( p > 0.05) in the operation duration, intraoperative blood loss, intraoperative pH, bicarbonate, lactate, postoperative hemoglobin, hemoglobin drift, blood transfusion, postoperative Cobb angle, correction rate, side bending flexibility, side bending correction index, length of hospitalization, and complications rate. Total PCA morphine usage was significantly lesser in the after-hours group (18.2 ± 15.3 mg) compared with the daytime group (24.6 ± 16.6 mg; p = 0.042).ConclusionsAfter-hours elective spine deformity corrective surgeries for healthy ambulatory patients with AIS were as safe as when they were done during daytime.

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