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. 2021 Jun 12;22:535. doi: 10.1186/s12891-021-04418-y

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — A Survival analysis of conversion to THA between patients who underwent multiple drilling and patients with a natural course of osteonecrosis progression. The difference was not statistically significant. (Kaplan-Meier method with long-rank test P = .191). Depending on the different extent of necrotic lesion, patients receiving multiple drilling showed near significant difference on survival rate in patients with necrotic lesion < 15% (B). However, neither extent of necrotic lesion of 15–30% (C) nor necrotic areas > 30% (D) with multiple drilling had an influence on conversion to THA compared to patients with natural course (P = .227, .995, respectively)