胫骨斜角变化对全膝关节假体的生物力学影响:三维有限元分析

B. Arı, M. Korkmaz, Alaettin Özer
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引用次数: 0

摘要

在全膝关节置换术中,放置假体时选择正确的胫骨斜角影响关节负荷。在我们的学习中;在三维右膝关节有限元结构模型中,研究了后倾角为0度、3度、5度和7度的假体在每次倾斜时膝关节弯曲0-30-60-90度对胫骨植入物和植入物缺口的载荷。通过这种方式,它旨在揭示在哪个斜坡上产生的荷载是最低的。采用三维2.5数字右膝关节实体模型建立有限元结构模型。通过两种类型的分析来检验PE插入物角度变化对胫骨构件的影响;在一定固定屈曲角下的静载荷下的静力结构分析,以及在膝关节转动0-90度范围内动态变化屈曲角下不同载荷随时间的瞬态分析。在0度和30度模型中,胫骨倾角为7度时胫骨插入物的载荷最小(分别为11.6和9.87 mpa), 60度和90度模型中胫骨倾角为5度时胫骨插入物的载荷最小(分别为9.07和11.4 mpa)。在0度和30度模型中,胫骨坡角3、5、7度处的胫骨插入物缺口没有压力,而在60度模型中,胫骨插入物坡角0、3、5、7度处的压力均为0,153 MPa,且压力集中在胫骨插入物连接处。胫骨植入物的负荷越高,膝关节假体中胫骨植入物的磨损越大。因此,手术中胫骨插入物放置的倾斜角很重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Biomechanical effects of the tibial slope angle change on total knee prosthesis: 3D finite elements analysis
: In total knee arthroplasty, finding the correct tibial slope angle while placing the prosthesis affects the joint load. In our study; the load on the tibial insert and the notch of the insert as a result of flexion of the knee joint 0-30-60-90 degrees at each inclination in prostheses applied with posterior inclination angles of 0,3,5 and 7 degrees was examined in the three-dimensional right knee finite element structural model. In this way, it was aimed to reveal at which slope the resulting load is the lowest. The finite element structural model was created using the 3D 2.5 number right knee solid model. Two types of analysis were performed to examine the effect of angle change of the PE Insert on tibia component; static structural analysis with static loads at certain fixed flexion angles, and transient analysis with time for varying loadings at dynamically changing flexion angles with rotation of the knee between 0-90 degrees. In the 0 and 30 degree models, the least load on the tibial insert was found at 7 degree tibial slop angle (11.6 and 9.87 mpa, respectively), in 60 and 90 degree models at 5 degree tibial slop angle (9.07 and 11.4 mpa respectively). In the models of 0 and 30 degrees, no pressure occured on the tibial insert notch at 3,5,7 degrees of tibial slop angles, while in the 60 degree model, a pressure of 0,153 MPa occured at all 0,3,5,7 degrees at 0 degrees tibial insert slop angle and this pressure was centered at the junction with the tibial insert. The higher the load on the tibial insert, the greater wear of the tibial insert in the knee prosthesis. For this reason, it is important with which slop angle the tibial insert should be placed during surgery.
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