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. 2019 Sep 24;10(5):647–656. doi: 10.1177/2192568219877878

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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 (https://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 2. — O-C2 angle—angle between the McGregor line and the inferior end plate of C2. O-C7 angle—angle between the McGregor line and the inferior end plate of C7 (O-C7 angle = O-C2 + C2-7 angle). C2-7 angle—angle between the inferior endplate of C2 and the inferior endplate of C7. T1 slope—the angle between the horizontal line and the superior endplate of C7. T1 slope has correlation with O-C7 angle (a high T1 slope requires high O-C7 angle) and O-C2 and C2-7 angles had inverse correlation to each other to maintain horizontal gaze.