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Updated: May 25, 2026
A Teleoperated Robotic System-Assisted Percutaneous Transiliac-Transsacral Screw Fixation Technique
Published on: January 6, 2023
[Anatomic study on percutaneous anterior transarticular screw fixation by CT three-dimensional imaging]
1Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, PR China.
Objective:
To improve the safety of the percutaneous anterior transarticular screw fixation (PATSF) by measuring the parameters related to PATSF.
Methods:
Spiral CT scan and three-dimensional reconstructions of the atlanto-axis were performed in 50 adult volunteers. The section of inner margin of atlantal superior articular facet, the coronal plane vertebral artery cavity, and the sagittal plane of atlanto-axis were obtained with multiplanar reconstruction on helical CT. atlantoaxial vertebral structure and the direction of vertebral artery cavity were observed. The parameters related to PATSF measured and analysed.
Results:
The suitable position of screw insertion was 4.0 mm from the midpoint of the axoidean anteroinferior margin. The maximum external angle of PATSF was (29.89 +/- 1.41) degrees; the minimum external angle was (4.37 +/- 0.87) degrees; the maximum backward angle was (32.41 +/- 1.66) degrees; the optimal external angle was (17.13 +/- 0.88) degrees; the optimal backward was (17.62 +/- 1.03) degrees; and the optimal screw length was (41.57 +/- 0.79) mm. The atlantoaxial articular facial diameter was (16.71 +/- 1.61) mm; the maximum distance of atlantal lateral displacement was (6.96 +/- 1.09) mm; and the ratio of them was 41.80% 5.69%.
Conclusion:
The optimal insertion of PATSF is safe and reliable. The screw can be inserted when the displacement the atlantal lateral mass is in a certain degree.
