Abstract
BackgroundA new radiographic view was proposed to evaluate the coronal plane alignment of the hindfoot under weightbearing conditions.MethodsWe studied 46 feet of individuals with normal appearing asymptomatic feet. On the antero-posterior roentgenogram using this new method, the line from the top of the sustentaculum tali to the lateral-inferior end of the posterior articular surface of the talus was obtained as the standard line showing varus or valgus of the calcaneus. We defined the angle between the longitudinal axis of the tibia and the standard line as described above as Varus-Valgus angle (V-V angle).ResultsThe mean (±SD) V-V angle of the 46 feet studied was 76.4 (±3.6) degrees.ConclusionThe findings from this study indicate that it is possible to estimate the alignment of the hindfoot quantitatively by comparing individuals to the mean V-V angle that we calculated in our sample, which was 76.4 degrees.
Highlights
A new radiographic view was proposed to evaluate the coronal plane alignment of the hindfoot under weightbearing conditions
The ankle joint, sustentaculum tali, and the lateralinferior end of the posterior facet of the calcaneus were clearly shown on the single x-ray view taken using this new method
The line from the top of the sustentaculum tali to the lateral-inferior aspect of the posterior facet of the calcaneus was designated as the standard line showing varus or valgus of the calcaneus (Figure 3)
Summary
A new radiographic view was proposed to evaluate the coronal plane alignment of the hindfoot under weightbearing conditions. Conclusion: The findings from this study indicate that it is possible to estimate the alignment of the hindfoot quantitatively by comparing individuals to the mean V-V angle that we calculated in our sample, which was 76.4 degrees. A previous study found a good correlation between clinical evaluation and measurements of hindfoot alignment [6]. These x-ray methods do not clearly show the hindfoot, so coronal alignment is difficult to evaluate precisely [7,8]. The aim of this study was to describe and evaluate a new method of radiographically imaging the coronal plane alignment of the hindfoot that could quantitatively estimate this alignment under weightbearing conditions
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