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. 2021 Jul 23;16:465. doi: 10.1186/s13018-021-02614-z

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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. 2 — Three-dimensional measurement of the femoral head coverage, weight-bearing area, and intact area. a The acetabular rim line (in black) for determining the acetabular coverage and acetabular arch line (in red) for determining the weight-bearing area. b The acetabular coverage projected on the femoral head in yellow. c The weight-bearing area projected on the femoral head in yellow. d1–d3 The intact area in yellow of types A, B, and C1 was determined by removing the necrotic area in orange (top view)