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. 2019 Oct 29;9:15490. doi: 10.1038/s41598-019-51871-w

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Average normalized disc height (nDH) along the AP axis of the disc at each segment level. Black-blue lines represent nDH at the upright position, while black-red lines represent nDH at the flexed position. The colored (blue or red) sections of each line indicate nDH values from 0.95–1.05 (±5% of central nDH) which roughly correspond to the nucleus pulposus of the disc. Superimposed colored and dashed lines illustrate differences in NP migration between segment levels.