Internal Medicine and Medical Investigation Journal

ISSN: 2474-7750

Comparison of Knee Angles in 2D and 3D EOS Imaging in Patients with Total Knee Arthroplasty


Author(s): eyed Jalil Abrisham1, Mohammad Reza Sobhan1 , Mostafa Jafari Bandarabadi2

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. 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.

Materials and Methods:

The present study is a cross-sec-

tional analytical study. In this study, 50 patients with knee osteoarthritis who under-

went 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 Varus and Valgus Knee angle, the lateral

distal femoral angle, mechanical medial proximal tibial angle, and joint line conver-

gence angle) 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.


The results showed that there was a correlation between the angle of varus,

lateral distal femoral angle, medial proximal tibial angle, and joint line convergence

angle in 2D and 3D images (


<0.001), indicating that 2D and 3D EOS imaging is not

different in examining mentioned angles.


From this study, it can be

concluded that the use of 3D imaging is not preferable to 2D imaging, and measure-

ments of angles in each of these two methods are almost identical

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