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. 2020 Jul 22;8(7):2325967120938767. doi: 10.1177/2325967120938767

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© The Author(s) 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (https://creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Imaging characteristics of a symptomatic os trigonum. Imaging was obtained upon positive clinical indication of posterior ankle impingement, represented here in a single dancer included in the study. (A) Lateral weightbearing radiographs obtained preoperatively revealed an os trigonum posterior to the talus (red arrow) compared with that obtained from (B) surgical excision at 6-month follow-up. Additionally, (C) demi-pointe lateral radiograph of the same dancer showed restriction of normal plantarflexion compared with that obtained (D) after follow-up. (E) Magnetic resonance imaging was used to further evaluate the size of the ossicle (red circle), as well as focal edema in the hindfoot of soft tissue structures being impinged.