Abstract
Purpose
Intra-operative image acquisition coupled with navigation aims to increase screw placement accuracy, and it is particularly helpful in complex spinal procedures. The aim of this study is to analyze the accuracy and reliability of posterior atlanto-axial fixation using spinal navigation combined with intra-operative 3D isocentric C-arm.
Methods
We retrospectively reviewed all patients presenting with C1–C2 instability and treated by posterior atlanto-axial fixation in our center between December 2016 and September 2018. Screw positioning was guided by intra-operative navigation, registered with surface matching procedure on a previously obtained CT scan and controlled by intra-operative 3D isocentric C-arm. Age, sex, pre- and post-operative neurological status, duration of surgery, presence/absence of vertebral artery injury, and screw placement were retrospectively collected from patients’ records. All patients underwent clinical and radiological follow-up at three months after surgery. Radiological assessment of screw positioning was performed by an independent radiologist using the Gertzbein and Robbins grading.
Results
N = 11 (7F, 4 M) consecutive patients were included, with a mean age of 72 years (range from 51 to 85). N = 44 navigated screws were inserted and controlled with intra-operative 3D fluoroscopy at the end of the procedure. An acceptable screw positioning (Gertzbein-Robbins grade A and B) was obtained in all cases (100%). No vertebral artery injury was observed. Mean operating time was 123 minutes. At three months, no screw loosening or displacement was observed.
Conclusion
In our experience, spinal navigation coupled with intra-operative 3D fluoroscopy proved to be reliable and safe for C1–C2 screw placement.
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Data availability
Patients’ data are anonymized, stored, and protected by password on Geneva University Hospitals Medical Database. Patients’ data are inserted in the database under authors’ responsibility.
Code availability
Custom Code is protected and retained by all authors.
Abbreviations
- VA:
-
Vertebral artery
- CT:
-
Computed tomography
- CTA:
-
CT angiography
- MRI:
-
Magnetic resonance imaging
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GJ: project draft, data extraction/analysis, and manuscript writing; AM: data extraction/analysis and manuscript writing; LP: data analysis and manuscript writing; VC radiological data analysis and critical revision of the manuscript; AB: manuscript writing and critical revision of the manuscript; ET: project draft, data analysis, manuscript writing, overall project supervision.
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The study protocol was approved by the local Ethical Committee (Project ID 2019-00791). All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Enrico Tessitore: Training fees from: Spineart, Medtronic, Depuy Synthes, Nuvasive.
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Jannelli, G., Moiraghi, A., Paun, L. et al. Atlantoaxial posterior screw fixation using intra-operative spinal navigation with three-dimensional isocentric C-arm fluoroscopy. International Orthopaedics (SICOT) 46, 321–329 (2022). https://doi.org/10.1007/s00264-021-05276-y
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DOI: https://doi.org/10.1007/s00264-021-05276-y