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. 2019 Mar 14;20:108. doi: 10.1186/s12891-019-2490-7

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© The Author(s). 2019

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 — Sequential radiographic images of the left tibia in a 22-year-old female patient who received low-intensity pulsed ultrasound (LIPUS) after 7.3 cm of tibial lengthening. At the end of the distraction phase, the anteroposterior (AP) (a) and lateral (b) images show a callus with a cylindrical shape and intermediate density. At the time of external fixator removal, the AP (c) and lateral (d) images show progression of callus consolidation with a cylindrical shape and normal density. The external fixation index of the patient was 29.6 days/cm. At 9 months postoperation, the AP (e) and lateral (f) images show full corticalization of the regenerated callus