• Spine · Jun 2022

    Augmented Reality Spine Surgery Navigation: Increasing Pedicle Screw Insertion Accuracy for Both Open and Minimally Invasive Spine Surgeries.

    • Brent Felix, Seyed Babak Kalatar, Bradley Moatz, Christoph Hofstetter, Michael Karsy, Ryan Parr, and Wendell Gibby.
    • Salt Lake Orthopedic Clinic, Salt Lake City, UT.
    • Spine. 2022 Jun 15; 47 (12): 865-872.

    Study DesignCollectively, seven cadavers were instrumented with 124 thoracolumbar pedicle screws using VisAR augmented reality/guidance. Sixty-five screws were inserted into four donors using open dissection spine surgery. Fifty-nine screws were positioned in three donors with a minimally invasive spine surgery (MISS) procedure. For both open and MISS, VisAR was used exclusively for pedicle screw navigation.ObjectiveThe objective of this study was to determine the accuracy of pedicle screw placement using VisAR for open spine and MISS procedures.Summary Of Background DataPedicle screw placement can be challenging depending on anatomical location and a surgeon's experience. AR may minimize fluoroscopy use and speed screw insertion.MethodsPrior to computed tomography (CT) a series of four image visible April Tag optical fiducials were attached to the backs' of the donors. Resulting images were used preoperatively for planned virtual pedicle screw pathways including entry point, trajectory, and depth. The study link was encrypted on a quick response (QR) code, printed, and viewed in the operating room (OR) by the surgeon using VisAR (HoloLens 2 headset). Viewing the code wirelessly uploads and launches the study, converting the DICOM data to holographic images which register to the fiducials on the donor's back. The annotated pathways for each pedicle were called up by voice command and the surgeon positioned each screw by aligning with the virtual guidance hologram.ResultsOverall, 124 pedicle screws were inserted with VisAR navigation with 96% accuracy (Gertzbein-Robbins grades A and B). The combined angle of error was 2.4° and the distance error was 1.9 mm.ConclusionAugmented reality is a highly accurate, emerging technology for navigating both open and minimally invasive spine surgery techniques with off-the-shelf headset hardware.Level Of EvidenceN/A.Copyright © 2022 The Author(s). Published by Wolters Kluwer Health, Inc.

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