The accuracy of femoral component rotational measurements using computed tomography—a cadaveric study

Abstract Background CT scans can be used to assess the rotational alignment of the femoral component following total knee arthroplasty (TKA). This is done by calculating the posterior condylar angle (PCA). However, the methods used may not account for the biomechanical functionality of the TKA compo...

Full description

Bibliographic Details
Main Authors: Onyedikachi Eseonu, Calum Cree, Martin Sambrook, Mark Blyth, Bryn Jones
Format: Article
Language:English
Published: BMC 2020-12-01
Series:Arthroplasty
Subjects:
Online Access:https://doi.org/10.1186/s42836-020-00052-6
_version_ 1818384376758534144
author Onyedikachi Eseonu
Calum Cree
Martin Sambrook
Mark Blyth
Bryn Jones
author_facet Onyedikachi Eseonu
Calum Cree
Martin Sambrook
Mark Blyth
Bryn Jones
author_sort Onyedikachi Eseonu
collection DOAJ
description Abstract Background CT scans can be used to assess the rotational alignment of the femoral component following total knee arthroplasty (TKA). This is done by calculating the posterior condylar angle (PCA). However, the methods used may not account for the biomechanical functionality of the TKA components. This cadaveric study aimed to determine whether the axis of scanning (mechanical or anatomical) alters the results of PCA calculations. Methods CT scans of 12 cadaveric adult femora were performed along the anatomical axis and the mechanical axis. The PCA was determined on each CT scan by measuring the relationship of the prosthetic posterior condyles to the surgical epicondylar axis of the femur. The mechanical and anatomical axis groups were further subdivided into best-fit and multi-slice subgroups. As a control, the posterior condylar angle was also calculated on photographic images of each femur. Bland-Altman plots were used to determine the correlation between the PCA values obtained from the different scanning axes and measurement techniques. Results There was no significant difference between the PCA measurements derived from anatomical and mechanical axis CT scans. The Pearson correlation co-efficient also indicated good correlation between the two scanning axes. Conclusion The axis of scanning does not significantly affect the PCA measurements. Therefore, the measurements may be reliably used for clinical decision-making, regardless of the axis of CT scanning.
first_indexed 2024-12-14T03:21:17Z
format Article
id doaj.art-cad1bc09e4b048b4952a91aef1018e2c
institution Directory Open Access Journal
issn 2524-7948
language English
last_indexed 2024-12-14T03:21:17Z
publishDate 2020-12-01
publisher BMC
record_format Article
series Arthroplasty
spelling doaj.art-cad1bc09e4b048b4952a91aef1018e2c2022-12-21T23:19:02ZengBMCArthroplasty2524-79482020-12-01211610.1186/s42836-020-00052-6The accuracy of femoral component rotational measurements using computed tomography—a cadaveric studyOnyedikachi Eseonu0Calum Cree1Martin Sambrook2Mark Blyth3Bryn Jones4Department of Trauma and Orthopaedic Surgery, Glasgow Royal InfirmaryDepartment of Trauma and Orthopaedic Surgery, Dumfries and Galloway Royal InfirmaryDepartment of Radiology, Eastbourne District General HospitalDepartment of Trauma and Orthopaedic Surgery, Glasgow Royal InfirmaryDepartment of Trauma and Orthopaedic Surgery, Glasgow Royal InfirmaryAbstract Background CT scans can be used to assess the rotational alignment of the femoral component following total knee arthroplasty (TKA). This is done by calculating the posterior condylar angle (PCA). However, the methods used may not account for the biomechanical functionality of the TKA components. This cadaveric study aimed to determine whether the axis of scanning (mechanical or anatomical) alters the results of PCA calculations. Methods CT scans of 12 cadaveric adult femora were performed along the anatomical axis and the mechanical axis. The PCA was determined on each CT scan by measuring the relationship of the prosthetic posterior condyles to the surgical epicondylar axis of the femur. The mechanical and anatomical axis groups were further subdivided into best-fit and multi-slice subgroups. As a control, the posterior condylar angle was also calculated on photographic images of each femur. Bland-Altman plots were used to determine the correlation between the PCA values obtained from the different scanning axes and measurement techniques. Results There was no significant difference between the PCA measurements derived from anatomical and mechanical axis CT scans. The Pearson correlation co-efficient also indicated good correlation between the two scanning axes. Conclusion The axis of scanning does not significantly affect the PCA measurements. Therefore, the measurements may be reliably used for clinical decision-making, regardless of the axis of CT scanning.https://doi.org/10.1186/s42836-020-00052-6Total knee arthroplastyTotal knee replacementRotationComputed tomographyCadaver
spellingShingle Onyedikachi Eseonu
Calum Cree
Martin Sambrook
Mark Blyth
Bryn Jones
The accuracy of femoral component rotational measurements using computed tomography—a cadaveric study
Arthroplasty
Total knee arthroplasty
Total knee replacement
Rotation
Computed tomography
Cadaver
title The accuracy of femoral component rotational measurements using computed tomography—a cadaveric study
title_full The accuracy of femoral component rotational measurements using computed tomography—a cadaveric study
title_fullStr The accuracy of femoral component rotational measurements using computed tomography—a cadaveric study
title_full_unstemmed The accuracy of femoral component rotational measurements using computed tomography—a cadaveric study
title_short The accuracy of femoral component rotational measurements using computed tomography—a cadaveric study
title_sort accuracy of femoral component rotational measurements using computed tomography a cadaveric study
topic Total knee arthroplasty
Total knee replacement
Rotation
Computed tomography
Cadaver
url https://doi.org/10.1186/s42836-020-00052-6
work_keys_str_mv AT onyedikachieseonu theaccuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT calumcree theaccuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT martinsambrook theaccuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT markblyth theaccuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT brynjones theaccuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT onyedikachieseonu accuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT calumcree accuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT martinsambrook accuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT markblyth accuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy
AT brynjones accuracyoffemoralcomponentrotationalmeasurementsusingcomputedtomographyacadavericstudy