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. 2019 Jan 22;7(1):2325967118819831. doi: 10.1177/2325967118819831

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© The Author(s) 2019

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (http://www.creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — Knee abduction angles (varus-valgus angle [VVA] and coronal plane angle [CPA], vertical axis) were measured as a function of flexion angle (horizontal axis) for several viewing angles. Viewing angle significantly affected CPA (dashed blue lines, P < .0001), whereas VVA (solid red line) was invariant to viewing angle. CPA differed significantly from VVA when CPA was measured in the unrotated coronal plane (viewing angle of 0°, solid blue line), a best-case scenario for measuring knee abduction from 2D video frames. Values in the figure are means ± SDs.