CT-navigated spinal instrumentations-three-dimensional evaluation of screw placement accuracy in relation to a screw trajectory pan
Background and Objectives: In the literature, spinal navigation and robot-assisted surgery improved screw placement accuracy, but the majority of studies only qualitatively report on screw positioning within the vertebra. We sought to evaluate screw placement accuracy in relation to a preoperative t...
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| Main Authors: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
1 September 2022
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| In: |
Medicina
Year: 2022, Volume: 58, Issue: 9, Pages: 1-17 |
| ISSN: | 1648-9144 |
| DOI: | 10.3390/medicina58091200 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3390/medicina58091200 Verlag, lizenzpflichtig, Volltext: https://www.mdpi.com/1648-9144/58/9/1200 
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| Author Notes: | Arthur Gubian, Lisa Kausch, Jan-Oliver Neumann, Karl Kiening, Basem Ishak, Klaus Maier-Hein, Andreas Unterberg and Moritz Scherer |
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| 245 | 1 | 0 | |a CT-navigated spinal instrumentations-three-dimensional evaluation of screw placement accuracy in relation to a screw trajectory pan |c Arthur Gubian, Lisa Kausch, Jan-Oliver Neumann, Karl Kiening, Basem Ishak, Klaus Maier-Hein, Andreas Unterberg and Moritz Scherer |
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| 520 | |a Background and Objectives: In the literature, spinal navigation and robot-assisted surgery improved screw placement accuracy, but the majority of studies only qualitatively report on screw positioning within the vertebra. We sought to evaluate screw placement accuracy in relation to a preoperative trajectory plan by three-dimensional quantification to elucidate technical benefits of navigation for lumbar pedicle screws. Materials and Methods: In 27 CT-navigated instrumentations for degenerative disease, a dedicated intraoperative 3D-trajectory plan was created for all screws. Final screw positions were defined on postoperative CT. Trajectory plans and final screw positions were co-registered and quantitatively compared computing minimal absolute differences (MAD) of screw head and tip points (mm) and screw axis (degree) in 3D-space, respectively. Differences were evaluated with consideration of the navigation target registration error. Clinical acceptability of screws was evaluated using the Gertzbein-Robbins (GR) classification. Results: Data included 140 screws covering levels L1-S1. While screw placement was clinically acceptable in all cases (GR grade A and B in 112 (80%) and 28 (20%) cases, respectively), implanted screws showed considerable deviation compared to the trajectory plan: Mean axis deviation was 6.3° ± 3.6°, screw head and tip points showed mean MAD of 5.2 ± 2.4 mm and 5.5 ± 2.7 mm, respectively. Deviations significantly exceeded the mean navigation registration error of 0.87 ± 0.22 mm (p < 0.001). Conclusions: Screw placement was clinically acceptable in all screws after navigated placement but nevertheless, considerable deviation in implanted screws was noted compared to the initial trajectory plan. Our data provides a 3D-quantitative benchmark for screw accuracy achievable by CT-navigation in routine spine surgery and suggests a framework for objective comparison of screw outcome after navigated or robot-assisted procedures. Factors contributing to screw deviations should be considered to assure optimal surgical results when applying navigation for spinal instrumentation. | ||
| 650 | 4 | |a Gertzbein-Robbins classification | |
| 650 | 4 | |a navigation-guided spine surgery | |
| 650 | 4 | |a pedicle screw accuracy | |
| 650 | 4 | |a spinal instrumentation | |
| 650 | 4 | |a spinal navigation | |
| 650 | 4 | |a three-dimensional accuracy | |
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