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. 2023 May 30;11(5):23259671231174475. doi: 10.1177/23259671231174475

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© The Author(s) 2023

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 4. — Discoid meniscus instability classification. Signs of anterior instability: (A) Arrow indicates direction of instability with attenuated appearance of meniscus anteriorly. (B) Thickened appearance of posterior horn of the meniscus relative to the opposite horn (posterior “megahorn”). Signs of posterior instability: (C) Yellow arrow indicates direction of instability with absence of meniscus posteriorly. (D) Thickened appearance of anterior horn of the meniscus relative to the opposite horn (anterior “megahorn”).Yellow oval in B and D highlight the DLM with a thickened appearance on coronal images at the posterior aspect of the knee (B) and the anterior aspect of the knee (D).