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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 7. — Sections stained with hematoxylin and eosin. (A) Control disc (axial section) demonstrating intact annulus fibrosus and adjacent nucleus pulposus. (B) Control disc (coronal section) demonstrating the coronal plane. (C) Drill-injured disc demonstrating disruption of the annulus fibrous extending into the nucleus. (D) Drill-injured disc under higher power demonstrating superficial localized fibrosis (arrow) at external annulus fibrosus with minimal vascular infiltration. (E) APN-injured disc demonstrating extensive lamellae disruption and vascular infiltration. (F) APN-injured disc demonstrating lamellar structure under high-power magnification with evidence of marked vascular invasion (arrow). Scale bar = 200 μm. APN, annulotomy and partial nucleotomy.