Radiographic measurement of bowleg deformity: variability due to method and limb rotation

In evaluation of bowlegs, the tibiofemoral axis (TFA) and the proximal tibial metaphyseal-diaphyseal angle (MDA) are commonly measured, but both are subject to measurement error. In this study, we determined the intraobserver errors for the MDA and TFA, comparing several different measurement techni...

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Bibliographic Details
Published inJournal of pediatric orthopaedics Vol. 14; no. 2; p. 147
Main Authors Stricker, S J, Faustgen, J P
Format Journal Article
LanguageEnglish
Published United States 01.03.1994
Subjects
Bone Diseases, Developmental - diagnostic imaging
Bone Diseases, Developmental - pathology
Child, Preschool
Humans
Infant
Leg - diagnostic imaging
Leg - pathology
Observer Variation
Radiography
Rotation
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Summary:In evaluation of bowlegs, the tibiofemoral axis (TFA) and the proximal tibial metaphyseal-diaphyseal angle (MDA) are commonly measured, but both are subject to measurement error. In this study, we determined the intraobserver errors for the MDA and TFA, comparing several different measurement techniques. We also determined the variability of these angles caused by 15 degrees and 30 degrees of external rotation of the knee. We noted that limb malrotation may affect the measurement variability of these angles significantly, especially the TFA. To minimize radiographic measurement error, the clinician must ensure neutral limb rotation and uniform measurement technique.
ISSN:0271-6798
DOI:10.1097/01241398-199403000-00003