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. 2017 Sep 12;18:397. doi: 10.1186/s12891-017-1758-z

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© The Author(s). 2017

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 — Analysis of anterior talofibular ligament (ATFL) dimension and signal intensity (SI) on axial MRI image. (1) The signal intensity (SI) was calculated at the ATFL site as well as the background site (approximately 2 cm near to the ATFL) using a region of interest (ROI). The signal/noise ratio (SNR) was calculated using the following equation: SNR = signal of ATFL / signal of background. The area of the ATFL ligament was directly measured by drawing the contour of ATFL. (2) The length of the ATFL. The ATFL was lined extending from the anterior and inferior borders of the fibula to the neck of the talus