KMID : 0311120210620050439
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Yonsei Medical Journal 2021 Volume.62 No. 5 p.439 ~ p.445
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Accuracy of 2D CT-Based Measurements of Rotational Alignment of the Femoral Component for Total Knee Arthroplasty
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Park Jun-Young
Kwon Hyuck-Min Cho Byung-Woo Lee Woo-Suk Yang Ick-Hwan Park Kwan-Kyu
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Abstract
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Purpose: We aimed to investigate the accuracy of two-dimensional computed tomography (2D-CT)-based methods for measuring rotational alignment of the femoral component during total knee arthroplasty in comparison to reference values for three-dimensional (3D) reconstruction.
Materials and Methods: We selected the ¡°most protruding transepicondylar axis section,¡± ¡°most protruding posterior condylar line section,¡± and ¡°distal femoral cut section¡± on 2D-CT images for 100 knees. We investigated posterior condylar angle (PCA) and condylar twist angle (CTA) values using three different methods on 2D-CT and compared to these values to those obtained using a 3D model.
Results: The mean PCA and CTA values were 2.8¡Æ and 7.0¡Æ on the 3D model and 2.0¡Æ to 2.1¡Æ and 5.9¡Æ to 6.0¡Æ on 2D-CT, respectively. Errors in PCA and CTA measurement included internal rotation of 0.8¡Æ and 1.1¡Æ with the 1-plane and 2-plane methods and 0.9¡Æ and 1.0¡Æ with the assumed resection method, respectively.
Conclusion: Mean errors in PCA and CTA values measured using three different methods on 2D-CT were not significantly different. However, PCA and CTA values measured on 2D-CT were approximately 1¡Æ smaller than their 3D values. Thus, we suggest that adding 1¡Æ to the mean PCA and CTA values obtained from a single plane of 2D-CT would provide values similar to those obtained from 3D reconstruction.
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KEYWORD
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Knee, osteoarthritis, total knee arthroplasty, rotational alignment of the femoral component, 2D-CT, 3D reconstruction
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