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Accuracy of 2D CT-Based Measurements of Rotational Alignment of the Femoral Component for Total Knee Arthroplasty

 Jun Young Park  ;  Hyuck Min Kwon  ;  Byung Woo Cho  ;  Woo Suk Lee  ;  Ick Hwan Yang  ;  Kwan Kyu Park 
 YONSEI MEDICAL JOURNAL, Vol.62(5) : 439-445, 2021-05 
Journal Title
Issue Date
Arthroplasty, Replacement, Knee* ; Femur / diagnostic imaging ; Femur / surgery ; Humans ; Knee Joint / diagnostic imaging ; Knee Joint / surgery ; Osteoarthritis, Knee* / surgery ; Reference Values ; Rotation ; Tomography, X-Ray Computed
2D-CT ; 3D reconstruction ; Knee ; osteoarthritis ; rotational alignment of the femoral component ; total knee arthroplasty
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° and 7.0° on the 3D model and 2.0° to 2.1° and 5.9° to 6.0° on 2D-CT, respectively. Errors in PCA and CTA measurement included internal rotation of 0.8° and 1.1° with the 1-plane and 2-plane methods and 0.9° and 1.0° 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° smaller than their 3D values. Thus, we suggest that adding 1° 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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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Orthopedic Surgery (정형외과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Hyuck Min(권혁민) ORCID logo https://orcid.org/0000-0002-2924-280X
Park, Kwan Kyu(박관규) ORCID logo https://orcid.org/0000-0003-0514-3257
Park, Jun Young(박준영) ORCID logo https://orcid.org/0000-0002-4713-4036
Yang, Ick Hwan(양익환)
Lee, Woo Suk(이우석) ORCID logo https://orcid.org/0000-0002-0798-1660
Cho, Byung Woo(조병우) ORCID logo https://orcid.org/0000-0002-7472-4103
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