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The effect of the frontal plane tibiofemoral angle on the contact stress and strain at the knee joint.

机译:额面胫股角对膝关节接触应力和应变的影响。

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摘要

Increased varus frontal plane tibiofemoral alignment leads to a larger varus knee moment which increases the mechanical loading on the medial compartment of the knee. This increased loading may accelerate the initiation and progression of osteoarthritis (OA). The purpose of this study was to observe the effect of the frontal plane tibiofemoral alignment on the overall stress and strain within the knee joint during single-leg stance and the stance phase of the gait cycle. Motion analysis and force platform were used to obtain both kinetics and kinematics of the knee joint for three subjects with different frontal plane tibiofemoral knee alignment (varus, normal and valgus). Inverse dynamics and a muscle force reduction model were used to calculate the knee joint reactions. Subject specific 3-D knee models were created from MRI data. Finite element analysis (FEA) was performed to obtain the stress and strain at the knee joint. In addition, the combined effect of body weight changes and different amounts of lateral and medial meniscectomy on the contact stresses on the knee was investigated. FEA results showed the larger varus knee moment led to larger normalized maximum stress and strain at the medial compartment of the knee cartilage. The percentage of the total knee force distributed to the medial compartment of the knee during single-leg support increased for the varus aligned individual. Simulated body weight changes showed larger percentage increases in the stress and strain for a varus individual for all simulated increase in body weight. For similar amounts of partial lateral and medial meniscectomy, lateral meniscectomy led to greater increases in the stress and strain compared to medial meniscectomy due to the larger role of the relative load bearing of the lateral meniscus. Results from this study could be used by researchers and health care professionals to develop methods to prevent the initiation or slow the progression of knee OA.
机译:内翻前额胫骨股骨对准的增加导致膝内翻力矩更大,这增加了膝盖内侧腔室的机械负荷。这种增加的负荷可能会加速骨关节炎(OA)的发生和发展。这项研究的目的是观察在单腿姿势和步态周期的姿势阶段,额面胫股对准对膝关节内整体应力和应变的影响。运动分析和力平台被用于获得三个额叶胫骨股骨平直度不同的受试者(内翻,正常和外翻)的膝关节动力学和运动学。使用逆动力学和肌肉力量减少模型来计算膝关节反应。根据MRI数据创建特定于受试者的3-D膝盖模型。进行了有限元分析(FEA),以获得膝关节处的应力和应变。此外,还研究了体重变化以及不同量的半月板和内侧半月板切除术对膝盖接触应力的综合影响。有限元分析结果表明,较大的膝关节内弯矩导致膝关节内侧腔室的标准化最大应力和应变更大。对于内翻内直的个体,在单腿支撑期间分配到膝盖内侧部分的总膝盖力的百分比增加。模拟的体重变化显示,对于所有模拟的体重增加,内翻个体的压力和应变的百分比增加更大。对于类似量的外侧半月板和内侧半月板切除术,与外侧半月板切除术相比,外侧半月板切除术导致应力和应变的增加更大,这是由于外侧半月板的相对承载作用更大。研究人员和卫生保健专业人员可以使用这项研究的结果来开发预防膝OA发生或减慢其进展的方法。

著录项

  • 作者

    Yang, Nicholas Hartley.;

  • 作者单位

    Northeastern University.;

  • 授予单位 Northeastern University.;
  • 学科 Engineering Biomedical.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 375 p.
  • 总页数 375
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物医学工程;机械、仪表工业;
  • 关键词

  • 入库时间 2022-08-17 11:37:39

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