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. 2017 Apr 7;18:148. doi: 10.1186/s12891-017-1509-1

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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. 2 — Kaplan-Meier curves for time-to-union in the TPD group versus the BP group. The Kaplan-Meier curve showed the time course of union in the TPD group and the BP group (p < 0.001, log-rank test). The thin black arrow shows the end of follow-up with non-union, and the bold white arrow indicates the end of follow-up due to surgical intervention. The union rate was 89% in the TPD group and 68% in the BP group by six months after treatment (p = 0.026, Fisher’s exact test). At the final follow-up, 97% of those in the TPD group and 90% of those in the BP group achieved a stable union (p = 0.243, Fisher’s exact test)