J Neurol Surg A Cent Eur Neurosurg 2021; 82(03): 191-196
DOI: 10.1055/s-0040-1721016
Original Article

Accuracy of Intraoperative Computed Tomography Assisted Dorsal Instrumentation in Spinal Revision Surgery

1   Klinik für Neurochirurgie, Uniklinik RWTH Aachen, Aachen, Germany
Hans Clusmann
1   Klinik für Neurochirurgie, Uniklinik RWTH Aachen, Aachen, Germany
Matthias Florian Geiger
1   Klinik für Neurochirurgie, Uniklinik RWTH Aachen, Aachen, Germany
Alexander Riabikin
2   Klinik für Diagnostische und Interventionelle Neuroradiologie, Uniklinik RWTH Aachen, Aachen, Germany
Christian-Andreas Mueller
1   Klinik für Neurochirurgie, Uniklinik RWTH Aachen, Aachen, Germany
Christian Blume
1   Klinik für Neurochirurgie, Uniklinik RWTH Aachen, Aachen, Germany
› Author Affiliations


Purpose Instrumentation in spinal revision surgery is considered challenging. Altered or missing anatomical landmarks hinder the surgeons' intraoperative orientation. In recent history, the importance of navigated approaches to spinal screw placement is constantly increasing. A growing number of medical centers have introduced intraoperative CT (iCT) navigation as a new clinical standard. In this study, we compare the accuracy of dorsal iCT-navigated instrumentation in revision surgery versus primary interventions.

Methods Between September 2017 and January 2019, we prospectively analyzed a consecutive series of dorsal instrumentation using iCT. Patients with previous operative interventions in the relevant spinal segments were included in the revision group and compared with a previously assessed group of primary interventions (nonrevision group). Each screw was assessed individually by an independent observer, making use of a modified Gertzbein and Robbins classification.

Results In this period, 39 patients were treated in the revision group with a total amount of 269 implanted screws. We achieved an overall accuracy of 95.91% compared with 95.12% in the nonrevision group (46 patients, 287 screws). We found no significant difference in accuracy between the two groups or any anatomical region of the spine.

Conclusion In summary, iCT-navigated screw placement yields a good accuracy in spinal revision surgery, without significant difference to primary interventions.

Compliance with Ethical Standards

All procedures involving human participants were in accordance with the ethical standards of the institutional research committee.

Publication History

Received: 09 November 2019

Accepted: 07 April 2020

Article published online:
01 January 2021

© 2021. Thieme. All rights reserved.

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

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