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In ankles with end-stage osteoarthritis or with total ankle replacement (TAR), radiographic landmarks based on joint surface morphology usually are obscured and inadequate for radiographic measurement. Furthermore, because of difficulty in reproducibly positioning the ankle for a standing radiograph, any radiographic measure to accurately describe ankle alignment must tolerate perturbations of ankle positioning on clinical radiographs. To identify a radiographic measure of anteroposterior tibial-talar alignment that meets those requirements, three methods were compared to determine their sensitivity to perturbations in ankle positioning.

Ankle Alignment on Lateral Radiographs. Part 1: Sensitivity of Measures to Perturbations of Ankle Positioning