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. 2018 Nov 5;8:16344. doi: 10.1038/s41598-018-33962-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Patient prior and intervening surgical procedures. Both the conservative (control) and single-event multi-level surgery (surgery) patient cohorts had similar surgical histories prior to the first analyzed gait visit (top). Intervening surgical procedures in the surgery patient cohorts were variable, and all analyzed limbs had at least two of the tabulated surgeries. Other specific surgical procedures not tabulated here may have been concurrently performed, but were much less frequent.