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A three-dimensional finite element stress analysis of the glenoid with and without a total shoulder arthroplasty component.

机译：有和没有全肩关节置换组件的关节盂的三维有限元应力分析。

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摘要

A three-dimensional finite element model of the glenoid was used to examine stresses in glenoids with and without total shoulder arthroplasty components. The glenoid components were metal-backed with a polyethylene liner. Two Young's Moduli and four thicknesses were used for the metal backings in order to study the effect of metal backing flexibility on stress shielding. The metal backings were modelled with and without pegs. The effect of a complete or partial removal of the subchondral bone thickness was studied. A central and a superior joint contact force were modelled. Stress shielding due to glenoid components was examined by comparing bone stresses in the implanted glenoid with bone stresses in the natural glenoid. The use of thinner metal backings reduced stress shielding although the thinner backings caused higher tensile stresses in the backing itself, particularly with the high Young's Modulus material. A sensitivity analysis of the values used for the cortical and cancellous bone Young's Moduli showed little effect on the stresses in the implanted glenoids when normalised against the stresses in the natural glenoid. The superior load case caused the components to tip superiorly which caused peak compressive stresses by pressing the superior edge of the metal backing into the underlying bone. Tipping of the implant caused the pegs to bend superiorly which created large stresses in the bone around the peg holes. The inclusion of a fibrous tissue layer between the metal backing and the subchondral bone exacerbated this situation. An experimental determination of the trabecular structure in cadaver glenoids showed a qualitative agreement between the orientation of the trabeculae and the principal stress directions calculated in the finite element analysis. (Abtract shortened by UMI).
机译：关节盂的三维有限元模型用于检查有和没有全肩关节置换组件的关节盂的应力。关节盂部件用聚乙烯衬里金属支持。为了研究金属背衬柔韧性对应力屏蔽的影响，将两个杨氏模量和四个厚度用于金属背衬。金属背衬是有钉或无钉的。研究了完全或部分去除软骨下骨厚度的效果。对中心和上级联合接触力进行了建模。通过将植入关节盂的骨应力与天然关节盂的骨应力进行比较，检查了由于关节盂部件引起的应力屏蔽。使用较薄的金属背衬可减少应力屏蔽，尽管较薄的背衬会在背衬本身中引起较高的拉应力，尤其是对于高杨氏模量材料。对皮层和松质骨的杨氏模量值的敏感性分析显示，当针对自然关节盂的应力标准化时，对植入关节盂的应力影响很小。优越的负载情况导致组件的顶端倾斜，这是通过将金属背衬的上边缘压入下层骨骼而导致峰值压缩应力的。植入物的倾倒导致钉子弯曲得更好，从而在钉子孔周围的骨头中产生了很大的应力。在金属背衬和软骨下骨之间包含纤维组织层加剧了这种情况。实验确定尸体盂骨小梁的结构表明，小梁的方向与有限元分析计算出的主应力方向之间存在定性的一致性。 （UMI缩短了摘要）。

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  • 作者

    DeVries, Sape.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Engineering Biomedical.
  • 学位 M.Sc.
  • 年度 1995
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物医学工程;
  • 关键词

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