Identifying alignment parameters affecting implanted patellofemoral mechanics

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
Clare K FitzpatrickPaul J Rullkoetter

Abstract

Complications of the patellofemoral (PF) joint remain a common cause for revision of total knee replacements. PF complications, such as patellar maltracking, subluxation, and implant failure, have been linked to femoral and patellar component alignment. In this study, a dynamic finite element model of an implanted PF joint was applied in conjunction with a probabilistic simulation to establish relationships between alignment parameters and PF kinematics, contact mechanics, and internal stresses. Both traditional sensitivity analysis and a coupled probabilistic and principal component analysis approach were applied to characterize relationships between implant alignment and resulting joint mechanics. Critical alignment parameters, and combinations of parameters, affecting PF mechanics were identified for three patellar designs (dome, modified dome, and anatomic). Femoral internal-external (I-E) alignment was identified as a critical alignment factor for all component designs, influencing medial-lateral contact force and anterior-posterior translation. The anatomic design was sensitive to patellar flexion-extension (F-E) alignment, while the dome, as expected, was less influenced by rotational alignment, and more by translational...Continue Reading

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Citations

Apr 30, 2013·Journal of Biomechanics·Clare K FitzpatrickPaul J Rullkoetter
Feb 1, 2014·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Roland Becker, Jon Karlsson
Jul 30, 2015·Medical Engineering & Physics·Ilan Eskinazi, Benjamin J Fregly
Jun 26, 2012·Journal of Biomechanics·Clare K FitzpatrickPaul J Rullkoetter
Mar 14, 2016·Surgical and Radiologic Anatomy : SRA·Gustavo RepleDavid Biau
Dec 18, 2014·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·L G ColesA W Miles
Oct 28, 2019·European Journal of Orthopaedic Surgery & Traumatology : Orthopédie Traumatologie·Takeshi MochizukiKen Okazaki
Feb 6, 2020·Biomechanics and Modeling in Mechanobiology·Azhar A AliPeter J Laz
Dec 6, 2016·The Knee·Charlie C YangPeter J Laz

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