Comparison of knee angles in two-dimensional and three-dimensional EOS imaging in patients with total knee arthroplasty
Background: Stand-alone radiological images (Weight-Bearing) are commonly used to measure alignment in coronal and sagittal planes. Although its proportions and angles may not be correct, it shows us the vertical and horizontal divergence.
Aim: In the present study, considering the ability of the EOS device to investigate angles in 3D, we investigated and compared the angular difference in 2D and 3D preoperative imaging in total knee arthroplasty.
Material and Methods: The present study is a cross-sectional analytical study. In this study, 50 patients with knee osteoarthritis who underwent knee replacement before EOS imaging of their lower extremities were enrolled. After obtaining patients' demographic data, the EOS was made from the hip, knee, and ankle area. The following angles (such as Varos and Valgus Knee angle, LDFA, mMPTA, and JLCA) in patients were reviewed and recorded once by an expert with the PACS software system, preoperatively. Then the data were analyzed by SPSS ver 21.
Results: The results showed that there was a correlation between the angle of varus, LDFA, MPTA, and JLCA in two-dimensional and three-dimensional images (P-Value <0. 001), indicating that two-dimensional and three-dimensional EOS imaging is not different in examining mentioned angles.
Conclusion: From this study, it can be concluded that the use of 3D imaging is not preferable to two-dimensional imaging, and measurements of angles in each of these two methods are almost identical.
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