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. 2020 Jan 8;21:15. doi: 10.1186/s12891-019-3030-1

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© The Author(s). 2020

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. 3 — Example of CFR parameter evaluation. Left, the stem diameter is 1.04 cm, whereas the narrowest part of medullary canal which is occupied by the stem is 1.42 cm. CFR_max = 1.04/1.42 = 0.73. CFR > 0.85: negative. Right, for the calculation of CFR_0.7 length, divide stem diameter (1.04 cm) by 0.7 equals to 1.49 cm. Measure the length from stem tip to the level where canal diameter is 1.49 cm. In this case, it is 1.15 cm. As a result, CFR_0.7 > 2 cm: negative, CFR_0.7 > 4 cm: negative, CFR_0.85length: 0 cm, CFR_0.7 length: 1.49 cm