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. 2016 Sep 5;11(1):26. doi: 10.1186/s13013-016-0088-5

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© The Author(s). 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. 3 — Histological assessment of fibrotic changes in ligamentum flavum (LF). Fibrotic Grade 1 (a), Fibrotic Grade 2 (b), Fibrotic Grade 3 (c), Fibrotic Grade 4 (d). LF sections were stained with Masson’s trichrome staining and imaged at 4X magnification under microscope. Areas marked with "E" signify keratin/elastin/muscle fibres (red stain), and "F" signifies collagen fibres (blue stain). There were no developmental spinal stenosis (DSS)/ non-DSS subjects with a fibrotic grade of 0 as all were stenotic patients