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Published on: April 14, 2023
Evaluation of Crossover Sign in Pelvis Models Made with a Three-Dimensional Printer
Amirhossein Salimi1, Seyed Peyman Mirghaderi2, Mohammad Javad Gholamzadeh3
1Student Research Committee, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Introduction:
Investigation of the crossover sign (COS) in different degrees of tilt in pelvises made by three-dimensional printing of CT scans among patients with normal hip versions was carried out.
Methods:
Radiology CT scans of 8 normal pelvises reconstructed in 3D and the effect of sequential tilting on the presence of the false-positive COS in 48 radiographs were investigated.
Results:
The COS was seen in 77% of the AP radiographs during tilt changes. The average distance between the tip of the coccyx and the symphysis pubis was 32.06 ± 10.99 mm. Also, COSs were present in all radiographs from 6 degrees tilt and above.
Conclusion:
Minor tilting of the pelvis can result in a false-positive crossover sign on AP plain radiographs.
