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. 2019 Sep 5;20:411. doi: 10.1186/s12891-019-2802-y

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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 — Detailed procedure of the operations: a, open the joint capsule through the incision of the medial retinaculum. b, in the dislocation group, lateral dislocating the patella using tweezers. c, in the patellectomy group, reversing the patellar to unfold the patellar articular facets, then separated the patellar from the tissue. d, in the patellectomy group, the incision was closed by 5–0 absorbable suture, in the dislocation group, the incision medial joint capsule was open for the natural healing