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Published on: March 12, 2021
Comparison of standard two-dimensional and three-dimensional corrected glenoid version measurements
Matthew D Budge1, Gregory S Lewis, Eric Schaefer
1Department of Orthopaedic Surgery, Penn State Milton S. Hershey Medical Center, Hershey PA, USA.
Journal of Shoulder and Elbow Surgery
|February 18, 2011
Summary
Three-dimensional (3D) CT reconstructions improve glenoid version measurement accuracy compared to standard 2D CT scans. Correcting 2D measurements to the scapular plane enhances precision, revealing significant differences in individual patient data.
Area of Science:
- Orthopedic Surgery
- Radiology
- Biomedical Imaging
Background:
- Concerns exist regarding the accuracy of 2D CT for measuring glenoid version.
- 3D CT reconstructions can orient the glenoid to the scapular plane for accurate measurements.
Purpose of the Study:
- To evaluate if 3D-corrected 2D CT scans for glenoid version differ significantly from standard 2D CT measurements.
- To assess the accuracy and reliability of 3D-corrected glenoid version measurements.
Main Methods:
- Thirty-four patients underwent axial 2D CT scans with 3D reconstruction.
- Glenoid version was measured using standard 2D cuts and 3D-corrected cuts perpendicular to the scapular plane.
- Measurements were repeated by three observers on two separate days to assess reproducibility.
Main Results:
- While overall average measurements were not significantly different, 47% of individual 2D measurements varied by 5-15 degrees from 3D-corrected values.
- 35% of 2D measurements differed by 5-10 degrees, and 12% differed by over 10 degrees.
- Both 2D and 3D-corrected measurements demonstrated good intraobserver and interobserver reliability.
Conclusions:
- Standard 2D CT measurements of glenoid version can be inaccurate due to scapular positioning variability.
- 3D reconstruction and correction to the scapular plane provide a more accurate assessment of glenoid version.
- This method enhances accuracy while maintaining high reliability in clinical populations.
