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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 3. — Axial magnetic resonance images (9.4-T) (A) Control disc demonstrating intact AF and hyperintense NP. (B) Drill injury disc demonstrating injury tract (arrow) extending to NP. (C) APN disc demonstrating broader injury tract (arrow) and decreased NP hyperintensity. (D) 9.4-T MRI Pfirrmann grades: drill-injured and APN-injured discs demonstrated significantly higher 9.4-T Pfirrmann grades than control discs with no significant difference between injured groups. AF, annulus fibrosus; NP, nucleus pulposus; APN, annulotomy and partial nucleotomy. *P < .05, **P < .005.