This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
A new preprint design is coming!
We have improved readability, clarity, accessibility, and opportunities for engagement.
Research article
Lihai Zhang
Department of Orthopedics, Chinese PLA General Hospital
Corresponding Author
ORCiD: https://orcid.org/0000-0003-3172-6309
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Background: Some problems have been found in the clinical application of biplanar navigation technology. In particular, conical distortions caused by the X-ray image intensifier and deleterious effects on the navigation image caused by respiratory motion are occasionally ignored by surgeons. This paper discusses possible errors in the practical application of biplanar navigation technology and performs an analysis of the experimental correction for the conical distortion caused by X-rays.
Methods: Five patients with unstable fractures of the pelvic posterior ring were included in this study. In four of these cases, the patient received a sacroiliac screw placement using biplanar navigation technology, while one received a respiratory motion test. The standard pelvic inlet and outlet positions were used for positioning precision verification. Using the images and manual tests, the point positioning error was measured and analyzed, and the image distortion was corrected by means of a geometric transformation mapping. A circle was fitted to the corrected lines, and the radius of this circle was used to evaluate the correction.
Results: The preoperative planning agreed with the sacroiliac screw placement performed using biplanar navigation technology (representing precise positioning) in only one of the four cases. The other three cases presented deviations. Because of the possibility to cut out the nailing channel, the positioning operation was converted to a manual method. The breathing motion test showed that the pelvis can vibrate back and forth with breathing movement, especially the sacral promontory, with a maximum amplitude above 5 mm. The positioning error of the points in space with the biplanar technology was within 2 mm (entrance point, 1.60±0.28 mm; exit point, 1.28±0.43 mm). The corrected image curvature was significantly reduced, and the error can be greatly reduced.
Conclusions: Conical distortion error and respiratory motion can affect the accuracy of biplanar navigation systems.
Keywords
Image intensifier, Biplanar navigation, Conical distortion, Respiratory oscillation, Image drift
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
This is a list of supplementary files associated with this preprint. Click to download.
Loading...
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 20 Feb, 2020
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Learn more about our company.
A new preprint design is coming!
We have improved readability, clarity, accessibility, and opportunities for engagement.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research article
Lihai Zhang
Department of Orthopedics, Chinese PLA General Hospital
Corresponding Author
ORCiD: https://orcid.org/0000-0003-3172-6309
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 20 Feb, 2020
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Background: Some problems have been found in the clinical application of biplanar navigation technology. In particular, conical distortions caused by the X-ray image intensifier and deleterious effects on the navigation image caused by respiratory motion are occasionally ignored by surgeons. This paper discusses possible errors in the practical application of biplanar navigation technology and performs an analysis of the experimental correction for the conical distortion caused by X-rays.
Methods: Five patients with unstable fractures of the pelvic posterior ring were included in this study. In four of these cases, the patient received a sacroiliac screw placement using biplanar navigation technology, while one received a respiratory motion test. The standard pelvic inlet and outlet positions were used for positioning precision verification. Using the images and manual tests, the point positioning error was measured and analyzed, and the image distortion was corrected by means of a geometric transformation mapping. A circle was fitted to the corrected lines, and the radius of this circle was used to evaluate the correction.
Results: The preoperative planning agreed with the sacroiliac screw placement performed using biplanar navigation technology (representing precise positioning) in only one of the four cases. The other three cases presented deviations. Because of the possibility to cut out the nailing channel, the positioning operation was converted to a manual method. The breathing motion test showed that the pelvis can vibrate back and forth with breathing movement, especially the sacral promontory, with a maximum amplitude above 5 mm. The positioning error of the points in space with the biplanar technology was within 2 mm (entrance point, 1.60±0.28 mm; exit point, 1.28±0.43 mm). The corrected image curvature was significantly reduced, and the error can be greatly reduced.
Conclusions: Conical distortion error and respiratory motion can affect the accuracy of biplanar navigation systems.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
This is a list of supplementary files associated with this preprint. Click to download.
Loading...