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. 2015 Nov 16;10:174. doi: 10.1186/s13018-015-0323-4

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© Yin et al. 2015

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. 1 — The definition of the trochlear range. a Resliced axial images from the proximal entrance to the distal end of the femoral trochlea in 1.5-mm increments were selected for the evaluation of the tibial tubercle-trochlear groove distance. The trochlear groove and posterior condyles exhibit distinct shapes at different levels of the distal femur. b Proximal level. c Mid level. d Distal level