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. 2020 Nov 27;10:20757. doi: 10.1038/s41598-020-77691-x

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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(A) Examples of tendon stiffness maps and corresponding B-mode images from the proximal region of injured and contralateral healthy AT of a patient two weeks after the rupture. SWE color maps are coded from blue to red, indicating low to high tissue stiffness. Note the low shear wave velocity values (ie, low stiffness) measured in the injured Achilles tendon. (B) SWE maps from a patient AT indicating a progressive increase in shear wave velocity over the 3-month observation period after the rupture. (C) Average time-course recovery of the injured AT showing approximately 65% recovery in tendon stiffness until 12 weeks after the injury. Values in the boxplots (N = 15/timepoint) are medians ± 1.5*Interquartile Range (IQR). *p < .05, **p < .0001 vs injured tendon; ^#p < .05, ^##p < .0001 vs baseline in the injured tendon.