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. 2018 Nov 12;6(11):2325967118807176. doi: 10.1177/2325967118807176

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© The Author(s) 2018

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (http://www.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. — The cliff sign. A perfect circle is created around the femoral head. If the lateral femoral head does not completely fill the perfect circle, it is considered a positive cliff sign (top row). Also shown is a femoral head that does completely fill the perfect circle laterally and is considered a negative cliff sign (bottom row).