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. 2016 Jul 16;13:64. doi: 10.1186/s12984-016-0170-5

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© The Author(s). 2016

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. 2 — Knee moment-angle and muscle force-length curves. a Knee moment-angle curve for typically developing (TD, grey) and cerebral palsy (CP, black) children, averaged over all subjects. Inverse dynamic results of the measurement are shown (dashed), as well as the optimized results of the muscle analysis (solid). b. Active and passive muscle force-length curves, based on the optimized passive properties S and K as averaged over all TD (thick grey) and CP (thick black) subjects, for hamstrings (solid) and vasti (dashed). The TD vasti curve mostly underlies the CP vasti curve. Default active and passive curves (thin lines) are based on Thelen (2003) and typically assumed equal for all muscles, both only scaling in amplitude to maximum isometric muscle force [33]