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. 2021 Oct 12;22:869. doi: 10.1186/s12891-021-04759-8

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© The Author(s) 2021

Open AccessThis 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/. 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 in a credit line to the data.

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Fig. 3 — A 31-year-old man with subtalar instability. Sagittal T2-weighted image (a) shows normal-looking IOLV (arrow) with uniform thickness and continuity in tarsal sinus. Ganglion cysts (*) along inferior extensor retinaculum induce tarsal sinus fat obliteration. 3D isotropic sagittal images (b and c) acquired sequentially in the medial direction and axial image (d) demonstrate irregularity in the inner half of IOLV (arrows). Arthroscopic image (e) of the tarsal sinus reveals the talocalcaneal joint on the right side and a chronic IOLV tear in the inner half; IOLV, interosseous ligament vertical segment