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Updated: Aug 11, 2026
A Spine Robotic-Assisted Navigation System for Pedicle Screw Placement
Published on: May 11, 2020
Accuracy of computer assisted percutaneous placement of iliosacral screws: a cadaveric study
S B Antekeier1, D P Antekeier, C H Crawford
1Orthopaedic Bioengineering Laboratory, Department of Orthopaedic Surgery, University of Louisville, Louisville, Kentucky 40202, USA. Sbante01@gwise.louisville.edu
Objective:
To determine the accuracy of computer-assisted fluoronavigation for percutaneous iliosacral screw placement.
Materials And Methods:
A fluoronavigation system (Stryker Navigation System, Stryker Leibinger, Kalamazoo, MI) was used to guide the placement of four iliosacral screws into the S-1 bodies of each of five cadaveric pelvic specimens with intact soft tissues. Accuracy of screw placement was verified by radiographs, CT scans, and direct dissection.
Results:
All 20 screws were placed accurately without complications. Nineteen screws were completely contained within the osseous "safe zone." On direct dissection, one screw was noted to have penetrated the S-1 foramina by 3 mm without impingement on the nerve root. This was not detected on radiograph or CT scan.
Conclusion:
The results of this study support the safety and accuracy of computer-assisted fluoronavigation for iliosacral screw placement. The advantages include decreased fluoroscopic time, real-time simultaneous visualization of all three views (inlet, outlet, and lateral), and increased accuracy of placement. Clinical study is warranted.
