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. 2018 Jan 30;8(6):570–578. doi: 10.1177/2192568217745068

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© The Author(s) 2018

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. — Intervertebral disc of the model. (a) Nucleus pulposus and bulk material for the annulus fibrosus. (b) Fibrous rings inside of the annulus fibrosus. Blue ring indicates ossified part in the case of ankylosing spondylitis (AS).