Effect of joint line preservation on mobile-type bearing unicompartmental knee arthroplasty: finite element analysis

Australasian Physical & Engineering Sciences in Medicine
Kyoung-Tak KangYong-Gon Koh

Abstract

In this study, we performed a virtual mobile-bearing unicompartmental knee arthroplasty (UKA) on the contact pressure in the tibial insert and articular cartilage by using finite element (FE) analysis to understand clinical observations and elaborate on the potential risks associated with a joint line preservation such as wear on tibial insert and osteoarthritis on other compartment. Neutral position of the knee joint was defined in 0 mm joint line, and contact pressure between tibial insert and articular cartilage varies with respect to changes of joint line. Therefore, evaluation of contact pressure may provide the degree of joint line preservation. The FE model for the joint line was developed using a perpendicular projection line from the medial tibial plateau to the anatomical axis. Seven FE models for joint lines in cases corresponding to ± 6, ± 4, ± 2, and 0 mm were modeled and analyzed in normal level walking conditions. The maximum contact pressure on the superior and inferior surfaces of the polyethylene insert increased when the joint line became positive while the maximum contact pressure on the articular cartilage increased when the joint line became negative. The increase in the maximum contact pressure in the pos...Continue Reading

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Citations

Nov 26, 2019·Chinese Medical Journal·Qi-Dong ZhangWan-Shou Guo
Nov 9, 2019·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Feifan LuWanshou Guo
Oct 21, 2021·Archives of Orthopaedic and Trauma Surgery·Riccardo D'AmbrosiMichael Tobias Hirschmann

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