Anatomical axis validation of lower extremity for different deformities: A radiological study

Aim: The aim of this study was to derive a pure, unbiased, reliable and accurate objective relationship between the local knee axis measurements through a short knee anteroposterior roentgenogram and the lower limb axis measurement through an orthoroentgenogram. Patients and Methods: Radiographs of...

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Main Authors: Meric Unal, Sabriye Ercan, Aydin Budeyri, Uğur Toprak, Abdülkerim Şalkaci
Format: Article
Language:English
Published: SAGE Publishing 2020-06-01
Series:SAGE Open Medicine
Online Access:https://doi.org/10.1177/2050312120923822
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author Meric Unal
Sabriye Ercan
Aydin Budeyri
Uğur Toprak
Abdülkerim Şalkaci
author_facet Meric Unal
Sabriye Ercan
Aydin Budeyri
Uğur Toprak
Abdülkerim Şalkaci
author_sort Meric Unal
collection DOAJ
description Aim: The aim of this study was to derive a pure, unbiased, reliable and accurate objective relationship between the local knee axis measurements through a short knee anteroposterior roentgenogram and the lower limb axis measurement through an orthoroentgenogram. Patients and Methods: Radiographs of 114 patients (114 knees) were evaluated by two independent raters for measurement of lower limb axis on an orthoroentgenogram and the local knee axis on short knee anteroposterior X-ray, which was derived by cropping the orthoroentgenogram by a blinded radiology assistant. The raters measured at two different time-points separated by an interval of 30-day period. Intra-rater and inter-rater reliabilities were calculated by intra-class correlation coefficients and three models were built to establish the relationships of X-ray anatomical axis with orthoroentgenogram anatomical axis, orthoroentgenogram anatomical axis with orthoroentgenogram mechanical axis and X-ray anatomical axis with orthoroentgenogram mechanical axis. Results: For three different measurements, intra-class correlation coefficients of Rater 2 were higher than 0.90 which shows perfect reliability, while that for Rater 1 was low. Furthermore, first measurements were more consistent than the second measurement. There was a strong positive correlation in all the three models except for varus cases in the last. Conclusion: The standardized correlation derived between the two different techniques for measuring knee alignment is fairly comparable with the studies in the past and would serve as a reliable template for future studies concerning relationships between the two, in addition to helping knee surgeons make more reliable and accurate interpretations through local knee axis measurements.
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spelling doaj.art-215683a2f622448d8b1d006c0d8d73ad2022-12-22T00:03:12ZengSAGE PublishingSAGE Open Medicine2050-31212020-06-01810.1177/2050312120923822Anatomical axis validation of lower extremity for different deformities: A radiological studyMeric Unal0Sabriye Ercan1Aydin Budeyri2Uğur Toprak3Abdülkerim Şalkaci4Department of Orthopaedics and Traumatology, Isparta City Hospital, Isparta, TurkeyDepartment of Sports Medicine, Faculty of Medicine, Suleyman Demirel University, Isparta, TurkeyDepartment of Orthopaedics and Traumatology, Faculty of Medicine, SANKO University, Gaziantep, TurkeyDepartment of Radiology, Faculty of Medicine, Osmangazi University, Eskişehir, TurkeyDepartment of Radiology, Faculty of Medicine, Suleyman Demirel University, Isparta, TurkeyAim: The aim of this study was to derive a pure, unbiased, reliable and accurate objective relationship between the local knee axis measurements through a short knee anteroposterior roentgenogram and the lower limb axis measurement through an orthoroentgenogram. Patients and Methods: Radiographs of 114 patients (114 knees) were evaluated by two independent raters for measurement of lower limb axis on an orthoroentgenogram and the local knee axis on short knee anteroposterior X-ray, which was derived by cropping the orthoroentgenogram by a blinded radiology assistant. The raters measured at two different time-points separated by an interval of 30-day period. Intra-rater and inter-rater reliabilities were calculated by intra-class correlation coefficients and three models were built to establish the relationships of X-ray anatomical axis with orthoroentgenogram anatomical axis, orthoroentgenogram anatomical axis with orthoroentgenogram mechanical axis and X-ray anatomical axis with orthoroentgenogram mechanical axis. Results: For three different measurements, intra-class correlation coefficients of Rater 2 were higher than 0.90 which shows perfect reliability, while that for Rater 1 was low. Furthermore, first measurements were more consistent than the second measurement. There was a strong positive correlation in all the three models except for varus cases in the last. Conclusion: The standardized correlation derived between the two different techniques for measuring knee alignment is fairly comparable with the studies in the past and would serve as a reliable template for future studies concerning relationships between the two, in addition to helping knee surgeons make more reliable and accurate interpretations through local knee axis measurements.https://doi.org/10.1177/2050312120923822
spellingShingle Meric Unal
Sabriye Ercan
Aydin Budeyri
Uğur Toprak
Abdülkerim Şalkaci
Anatomical axis validation of lower extremity for different deformities: A radiological study
SAGE Open Medicine
title Anatomical axis validation of lower extremity for different deformities: A radiological study
title_full Anatomical axis validation of lower extremity for different deformities: A radiological study
title_fullStr Anatomical axis validation of lower extremity for different deformities: A radiological study
title_full_unstemmed Anatomical axis validation of lower extremity for different deformities: A radiological study
title_short Anatomical axis validation of lower extremity for different deformities: A radiological study
title_sort anatomical axis validation of lower extremity for different deformities a radiological study
url https://doi.org/10.1177/2050312120923822
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