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. 2020 Jun 22;11(6):903–910. doi: 10.1177/2192568220932879

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© The Author(s) 2020

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 1. — Overview of the radiographic parameters of interest. This is an example for L4-5 transforaminal lumbar interbody fusion: A. Segmental lordosis (SL) is defined as the angle subtended by the superior endplate line of the upper instrumented vertebra and the inferior endplate line of the lower instrumented vertebra. B. Global lumbar lordosis (LL) is defined as the angle subtended by the inferior endplate line of T12 and the superior endplate line of S1.