Sanchis-Alfonso, VicenteAlastruey-López, DiegoGinovart, GerardMontesinos-Berry, ErikGarcía-Castro, FabioRamirez-Fuentes, CristinaMonllau García, Juan CarlosAlberich-Bayarri, AngelPérez, María Angeles2020-02-122020-02-122019Sanchis-Alfonso V, Alastruey-López D, Ginovart G, Montesinos-Berry E, García-Castro F, Ramírez-Fuentes C. et al. Parametric finite element model of medial patellofemoral ligament reconstruction model development and clinical validation. J Exp Orthop. 2019 Jul 5;6(1):32. DOI: 10.1186/s40634-019-0200-x2197-1153http://hdl.handle.net/10230/43551Background: Currently, there is uncertainty regarding the long-term outcome of medial patellofemoral ligament reconstructions (MPFLr). Our objectives were: (1) to develop a parametric model of the patellofemoral joint (PFJ) enabling us to simulate different surgical techniques for MPFLr; (2) to determine the negative effects on the PFJ associated with each technique, which could be related to long-term deterioration of the PFJ. Methods: A finite element model of the PFJ was created based on CT data from 24 knees with chronic lateral patellar instability. Patella contact pressure and maximum MPFL-graft stress at five angles of knee flexion (0, 30, 60, 90 and 120°) were analysed in three types of MPFLr: anatomic, non-anatomic with physiometric behaviour, and non-anatomic with non-physiometric behaviour. Results: An increase in patella contact pressure was observed at 0 and 30° of knee flexion after both anatomic and non-anatomic MPFLr with physiometric behaviour. In both reconstructions, the ligament was tense between 0 and 30° of knee flexion, but at 60, 90 and 120°, it had no tension. In the third reconstruction, the behaviour was completely the opposite. Conclusion: A parametric model of the PFJ enables us to evaluate different types of MPFLr throughout the full range of motion of the knee, regarding the effect on the patellofemoral contact pressure, as well as the kinematic behaviour of the MPFL-graft and the maximum MPFL-graft stress.application/pdfengCopyright © The Author(s). 2019. Open Access This 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.info:eu-repo/semantics/articlehttp://dx.doi.org/10.1186/s40634-019-0200-xFinite element methodologyMPFL reconstructionMPFL-stressMedial patellofemoral ligamentPatellofemoral contact pressurePatellofemoral jointinfo:eu-repo/semantics/openAccess