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. 2017 Apr 20;18:165. doi: 10.1186/s12891-017-1468-6

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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. 7 — Forest plot for the development of osteonecrosis of any grade at two or more years following open reduction. Including the data of six studies, 258 hips were analyzed. There was no statistically significant association between the ossific nucleus and the development of osteonecrosis