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The EOS 3D imaging system reliably measures posterior tibial slope
Andreas Hecker1, Till D Lerch2, Rainer J Egli2
1Department of Orthopaedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland. andreas.hecker@insel.ch.
Journal of Orthopaedic Surgery and Research
|June 17, 2021
Summary
The EOS 3D imaging system reliably measures posterior tibial slope (PTS), comparable to CT scans. This system offers a lower radiation alternative for knee assessments, providing valuable sagittal plane information.
Area of Science:
- Orthopedic imaging
- Radiology
- Biomedical engineering
Background:
- Posterior tibial slope (PTS) is a key metric in assessing knee conditions.
- The EOS 3D imaging system offers a lower-radiation alternative for obtaining anteroposterior (AP) and lateral long leg radiographs (LLRs).
Purpose of the Study:
- To evaluate the reliability of the EOS 3D imaging system for measuring posterior tibial slope (PTS).
- To compare PTS measurements from EOS 3D imaging with those from computed tomography (CT).
Main Methods:
- Retrospective analysis of 56 knees comparing EOS 3D scans and CT scans.
- Medial and lateral PTS were measured by a radiologist and an orthopaedic surgeon twice.
- Intraclass correlation (ICC) assessed inter- and intrarater reliability; Student t test and Pearson correlation compared modalities.
Main Results:
- Mean medial PTS: EOS 8.5°, CT 7.7°. Mean lateral PTS: EOS 7.4°, CT 7.0°.
- Excellent interrater reliability for both EOS (0.880 medial, 0.765 lateral) and CT (0.884 medial, 0.887 lateral).
- Excellent intrarater reliability for both readers on both EOS and CT measurements (ICC range 0.868–0.986).
Conclusions:
- EOS 3D imaging system demonstrates reliability and reproducibility for PTS measurements, on par with CT.
- The EOS system is recommended due to its ability to capture sagittal plane information with reduced radiation exposure compared to conventional LLRs.
