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. 2014 Dec 12;15:426. doi: 10.1186/1471-2474-15-426

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© Bączkowicz and Majorczyk; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Signal time-frequency analysis representative for particular PFJ disorders. (A), control healthy knee; (B) knee with lateral patellar compression syndrome; (C) knee with chondromalacia; (D) knee with patellofemoral joint osteoarthritis.