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. 2016 Feb 29;21:7. doi: 10.1186/s40001-016-0202-4

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© Xin 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. 8 — Changes in disc height index (DHI) after surgery. There was a slow, progressive decrease in the disc height of operated discs over time. The DHI in both the 16G puncture and annulus trephination groups were significantly lower than the DHI of the control group after surgery (**P < 0.01, vs. control group). The DHI of the PLGA implantation group was comparable to that of the control group and significantly higher than those in the 16G puncture group and annulus trephination group over the 6 months (*P < 0.05, vs. 16G puncture group or annulus trephination group)