Abstract
ObjectiveTo compare the posterior condylar angle measured with Kanekasu radiograph and 2D-CT with the gold standard 3D-CT following primary total knee arthroplasty (TKA).MethodsEighty-two knees with pain following TKA were included in this retrospective study. Two independent raters measured the anatomical and surgical posterior condylar angles twice on each Kanekasu radiograph and 2D-CT. These measurements were compared against the 3D-CT measurement. The intra- and interrater reliability of the Kanekasu radiograph and 2D-CT and the correlation with 3D-CT were calculated.ResultsThe intra- and interrater reliability for measurements of the anatomical posterior condyle angle for the Kanekasu radiograph and the 2D-CT were excellent for both raters (0.85–0.92). For the less experienced rater 1, the intrarater reliability was significantly better for 2D-CT than Kanekasu radiograph for measuring both the surgical (p < 0.01) and anatomical posterior condyle angles (p < 0.05). For the experienced rater 2, the intrarater reliability was significantly better for Kanekasu radiograph than 2D-CT for measurement of the surgical posterior condyle angle (p < 0.05). The correlation with 3D-CT is higher in 2D-CT than in Kanekasu radiograph (p < 0.01). While the Kanekasu radiograph predicts the 3D-CT angle with 65.9%, 2D-CT can measure the true angle with 82.9% certainty.ConclusionMeasurements using the anatomical transepicondylar axis are easier to replicate compared to the surgical transepicondylar axis. In comparison with the gold standard 3D-CT, 2D-CT showed a significantly higher correlation with 3D-CT than the Kanekasu measurements. If 3D-CT is available, it should be preferred over 2D-CT and Kanekasu view radiograph for femoral component rotation measurements.
Highlights
Femoral component position in total knee arthroplasty (TKA) is considered to be an important factor for clinical outcome [1,2,3]
The intra- and interrater reliability for measurements of the anatomical posterior condyle angle for both the Kanekasu view radiograph, and the 2D-Computer tomography (CT) were excellent for both raters (0.85–0.92)
For R2, the intrarater reliability was significantly better for Kanekasu view radiograph than 2D-CT for measurement of the surgical posterior condyle angle (p < 0.05), there was no significant difference between the intraclass correlation coefficients (ICCs) for the anatomical posterior condyle angle
Summary
Femoral component position in total knee arthroplasty (TKA) is considered to be an important factor for clinical outcome [1,2,3]. Femoral component rotation is defined by the posterior condylar axis (PCA) relative to the surgical [10, 11], or anatomical transepicondylar axis (sTEA or aTEA) [12]. In literature, this angle is referred to as the posterior condylar angle [10, 11, 13]. A number of different methods of assessing femoral component rotational alignment have been described and a variety are used in clinical practice [13, 14].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
