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. 2020 Jan 17;20:15. doi: 10.1186/s12893-020-0680-8

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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 — Typical case in the Isobar TTL group: A old patient with two-segment degenerative lumbar disease (L3/4 and L4/5). a-d X-ray and e and f MRI images of the patient before surgery; g-i X-ray and j-l images of the patient at the last follow-up