• Daniel Mendelsohn, Jason Strelzow, Nicolas Dea, Nancy L Ford, Juliet Batke, Andrew Pennington, Kaiyun Yang, Tamir Ailon, Michael Boyd, Marcel Dvorak, Brian Kwon, Scott Paquette, Charles Fisher, and John Street.
• Combined Neurosurgical and Orthopedic Spine Program, Vancouver General Hospital, Departments of Orthopedics and Neurosurgery, University of British Columbia, Vancouver, Canada; Faculty of Dentistry, Department of Oral Biological and Medical Sciences, University of British Columbia, Vancouver, Canada.
• Spine J. 2016 Mar 1; 16 (3): 343-54.

Background ContextImaging modalities used to visualize spinal anatomy intraoperatively include X-ray studies, fluoroscopy, and computed tomography (CT). All of these emit ionizing radiation.PurposeRadiation emitted to the patient and the surgical team when performing surgeries using intraoperative CT-based spine navigation was compared.Study Design/SettingThis is a retrospective cohort case-control study.Patient SampleSeventy-three patients underwent CT-navigated spinal instrumentation and 73 matched controls underwent spinal instrumentation with conventional fluoroscopy.Outcome MeasuresEffective doses of radiation to the patient when the surgical team was inside and outside of the room were analyzed. The number of postoperative imaging investigations between navigated and non-navigated cases was compared.MethodsIntraoperative X-ray imaging, fluoroscopy, and CT dosages were recorded and standardized to effective doses. The number of postoperative imaging investigations was compared with the matched cohort of surgical cases. A literature review identified historical radiation exposure values for fluoroscopic-guided spinal instrumentation.ResultsThe 73 navigated operations involved an average of 5.44 levels of instrumentation. Thoracic and lumbar instrumentations had higher radiation emission from all modalities (CT, X-ray imaging, and fluoroscopy) compared with cervical cases (6.93 millisievert [mSv] vs. 2.34 mSv). Major deformity and degenerative cases involved more radiation emission than trauma or oncology cases (7.05 mSv vs. 4.20 mSv). On average, the total radiation dose to the patient was 8.7 times more than the radiation emitted when the surgical team was inside the operating room. Total radiation exposure to the patient was 2.77 times the values reported in the literature for thoracolumbar instrumentations performed without navigation. In comparison, the radiation emitted to the patient when the surgical team was inside the operating room was 2.50 lower than non-navigated thoracolumbar instrumentations. The average total radiation exposure to the patient was 5.69 mSv, a value less than a single routine lumbar CT scan (7.5 mSv). The average radiation exposure to the patient in the present study was approximately one quarter the recommended annual occupational radiation exposure. Navigation did not reduce the number of postoperative X-rays or CT scans obtained.ConclusionsIntraoperative CT navigation increases the radiation exposure to the patient and reduces the radiation exposure to the surgeon when compared with values reported in the literature. Intraoperative CT navigation improves the accuracy of spine instrumentation with acceptable patient radiation exposure and reduced surgical team exposure. Surgeons should be aware of the implications of radiation exposure to both the patient and the surgical team when using intraoperative CT navigation.Copyright © 2016 Elsevier Inc. All rights reserved.

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