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. 2018 May 7;19:135. doi: 10.1186/s12891-018-2059-x

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© The Author(s). 2018

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. 1 — T2 weighted axial MR images of the lumbar spine. Images represent Kjaer grade [16] 0 (left), 1 (center), and 2 (right) muscles of the lumbar spine. All images are from patients undergoing surgery for low back pain related pathology