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Updated: Apr 6, 2026
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Published on: February 17, 2023
Can rotational alignment of total knee arthroplasty be measured on MRI?
Mirco Sgroi1, M Faschingbauer2, K Javaheripour-Otto2
1Department of Orthopaedics and Orthopaedic Surgery, University of Ulm, Oberer Eselsberg 45, 89081, Ulm, Germany. sgroi.mirco@yahoo.de.
Background And Purpose:
The aim of this study was to investigate the potential of MRI to determine rotational alignment after TKA in comparison to the gold standard, CT.
Methods:
Rotational alignment was measured in the transverse plane on CT and MR-images in 14 patients prior to TKA revision. Differences between CT and MRI measurements were analysed.
Results:
There was a strong correlation between CT and MRI measurements for both the tibial (r = 0.929) and femoral (r = 0.942) components with a mean difference of 0.47 ± 1.3 and 0.13 ± 3.2 degrees, respectively.
Interpretation:
Despite artefact formation, it can be concluded that the rotational alignment of metallic TKA components can be measured by MRI as accurately as by CT.
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