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. 2018 Jun 10;8(8):847–859. doi: 10.1177/2192568218779988

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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 6. — Collagen content (% dry weight). (A) AF1 APN group discs had significantly more collagen than both control and drill-injured discs. (B) AF4 APN group collagen was significantly higher than control discs. (C) NP1 APN group collagen was significantly higher than both control and drill injury collagen. (D) NP2 collagen demonstrated the same pattern. (E) NP total also demonstrated an increase in collagen in the APN group relative to the control group. (F) Total disc collagen was significantly increased in the APN group relative to both control and drill-injured discs. AF, annulus fibrosus; NP, nucleus pulposus; APN, annulotomy and partial nucleotomy. *P < .05, **P < .005.