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. 2020 Jan 14;21:30. doi: 10.1186/s12891-020-3051-9

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© The Author(s). 2020

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. 2 — a The disagreement regarding the bilateral intervertebral space. One side of the intervertebral height space at L3/4 is significantly smaller than on the other side (yellow arrow). b The red arrow indicates that the trailing edge of the L3 vertebral body above the L3/4 disc protrudes backward from the posterior edge of the L4 vertebral body, suggesting that adjacent segment degeneration has occurred. The white arrow indicates postoperative edema of the fascia behind the lumbar spine in the regular OLIF group