Influence of stem geometry on mechanics of cemented femoral hip components with a proximal bond
Influence of stem geometry on mechanics of cemented femoral hip components with a proximal bond
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DOI：
10.1002/jor.1100150511
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发表时间：
1997-09-01
影响因子：
2.8
通讯作者：
Ayers, DC
中科院分区：
文献类型：
--
作者：
Mann, KA;Bartel, DL;Ayers, DC
使用 Charnley 柄几何形状和改进的 Charnley 柄几何形状开发了具有近端柄-骨水泥粘合的骨水泥股骨髋关节组件的非线性三维有限元模型，该几何形状在柄的远端三分之二上具有圆柱形横截面（远端圆形）。当近端柄-骨水泥界面脱粘时，Charnley 柄和 Distal-Round 柄的近端骨水泥套的峰值拉应力分别增加 63% 和 74%。具有近端粘结的柄-骨水泥界面上的剪切应力，远端圆形柄比 Charnley 柄大 29%。近端柄-骨水泥界面脱粘后，远端圆形柄的骨水泥套中的峰值拉应力比 Charnley 柄大 15%。结果表明，通过使用近端柄-骨水泥粘合，Charnley 柄和远端圆形柄的近端骨水泥套内的应力可显着降低。然而，由于剪切应力增加，远端圆形柄脱粘的风险可能更高，并且一旦脱粘，远端圆形柄由于水泥套失效而进一步松动的风险也将更高。
Nonlinear, three-dimensional, finite element models of cemented femoral hip components with a proximal stem-cement bond were developed with use of a Charnley stem geometry and a modified Charnley stem geometry that had a cylindrical cross section over the distal two-thirds of the stem (Distal-Round). Peak tensile stresses in the proximal cement mantle increased 63 and 74% for the Charnley and Distal-Round stems, respectively, when the proximal stem-cement interface was debonded. The shear stresses over the stem-cement interface with a proximal bond were 29% larger for the Distal-Round stem than for the Charnley stem. After the proximal stem-cement interface was debonded, the peak tensile stresses in the cement mantle were 15% larger for the Distal-Round stem than for the Charnley stem. The results illustrate that stresses within the proximal cement mantle could be substantially reduced for both Charnley and Distal-Round stems through use of a proximal stem-cement bond. However, the risk of debonding may be higher for the Distal-Round stem because of increased shear stresses, and once debonded the risk of further loosening due to failure of the cement mantle would also be higher for the Distal-Round stem.