A novel computer-assisted drill guide template for placement of C2 laminar screws
- 11 June 2009
- journal article
- Published by Springer Science and Business Media LLC in European Spine Journal
- Vol. 18 (9), 1379-1385
- https://doi.org/10.1007/s00586-009-1051-4
Abstract
The present method of C2 laminar screw placement relies on anatomical landmarks for screw placement. Placement of C2 laminar screws using drill template has not been described in the literature. The authors reported on their experience with placement of C2 laminar screws using a novel computer-assisted drill guide template in nine patients undergoing posterior occipito-cervical fusion. CT scan of C2 vertebrae was performed. 3D model of C2 vertebrae was reconstructed by software MIMICS 10.01. The 3D vertebral model was then exported in STL format, and opened in a workstation running software UG imageware12.0 for determining the optimal laminar screw size and orientation. A virtual navigational template was established according to the laminar anatomic trait. The physical vertebrae and navigational template were manufactured using rapid prototyping. The navigational template was sterilized and used intraoperative to assist the placement of laminar screw. Overall, 19 C2 laminar screws were placed and the accuracy of screw placement was confirmed with postoperative X-ray and CT scanning. There were not complications of related screws insertion. Average follow-up was 9 months (range 4–13 months), 77.8% of the patients exhibited improvement in their myelopathic symptoms; in 22.2% the symptoms were unchanged. Postoperative computed tomographic (CT) scanning was available for allowing the evaluation of placement of thirteen C2 laminar screws, all of which were in good position with no spinal canal violation. This study shows a patient-specific template technique that is easy to use, can simplify the surgical act and generates highly accurate C2 laminar screw placement. Advantages of this technology over traditional techniques include planning of the screw trajectory is done completely in the presurgical period as well as the ability to size the screw to the patient’s anatomy.Keywords
This publication has 31 references indexed in Scilit:
- Accuracy of Intraoperative Plain Radiographs to Detect Violations of Intralaminar Screws Placed Into the C2 VertebraeSpine, 2007
- Placement of C2 laminar screws using three-dimensional fluoroscopy-based image guidanceEuropean Spine Journal, 2007
- C2 Crossing Laminar Screws: Cadaveric Morphometric AnalysisOperative Neurosurgery, 2006
- Pediatric atlantoaxial fixation with bilateral, crossing C-2 translaminar screwsJournal of Neurosurgery: Pediatrics, 2006
- Translaminar rigid screw fixation of the axisJournal of Neurosurgery: Spine, 2005
- Evaluation of a transpedicular drill guide for pedicle screw placement in the thoracic spineEuropean Spine Journal, 2003
- Computer Navigation of Parapedicular Screw Fixation in the Thoracic SpineSpine, 2001
- Arteriovenous fistula as a complication of C1–2 transarticular screw fixationJournal of Neurosurgery, 1996
- Anatomic Consideration of C2 Pedicle Screw PlacementSpine, 1996
- The interspinous method of posterior atlantoaxial arthrodesisJournal of Neurosurgery, 1991