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. 2016 Apr 29;17:191. doi: 10.1186/s12891-016-1015-x

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© Shao et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — μ-CT scan revealing that the posterior portions of the removed intervertebral discs contained more ossification sites than the anterior portions. White spots indicate the calcification spots in the removed disc. a is a Pfirrmann grade III disc, and (b) is a Pfirrmann grade V disc