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. 2020 Sep 29;11(8):1230–1237. doi: 10.1177/2192568220944169

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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 2. — T1-UIV angle and unfused-PJA. T1-UIV is measured from the superior endplate of the upper instrumented vertebra to the superior endplate of T1 vertebra. Unfused-PJA is measured from the superior endplate of the upper instrumented vertebra to the superior endplate of the second vertebrae above. Abbreviations: C, cervical; T, thoracic; L, lumbar; T1SPI, T1 spino-pelvic inclination; TK, thoracic kyphosis; LL, lumbar lordosis; PT, pelvic tilt; PI, pelvic incidence; SVA, sagittal vertical axis; UIV, upper instrumented vertebra; T1-UIV, angle between T1 and UIV; Unfused-PJA, proximal junctional angle of unfused spine.