FINITE-ELEMENT STUDIES OF SOME JUXTARTICULAR STRESS CHANGES DUE TO LOCALIZED SUBCHONDRAL STIFFENING
FINITE-ELEMENT STUDIES OF SOME JUXTARTICULAR STRESS CHANGES DUE TO LOCALIZED SUBCHONDRAL STIFFENING
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DOI：
10.1016/0021-9290(84)90075-7
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发表时间：
1984-01-01
影响因子：
2.4
通讯作者：
BURR, DB
中科院分区：
文献类型：
--
作者：
BROWN, TD;RADIN, EL;BURR, DB
对机械诱发骨关节炎的动物模型进行了有限元分析。该数值模型用于探讨在绵羊软骨下板下方植入小圆柱塞后，与局部软骨下硬化相关的应力传递异常。拟静态平面应变计算公式包含非线性关节内接触问题的求解，并与相应的解析解和体内实验结果进行了对比验证。由于金属种植体插入引起的应力畸变在种植体周围的骨中最为明显，但在覆盖的深层透明软骨层中也可能引起高达50%的标称压应力升高。植入金属塞后的局部软骨应力升高可能受到多种因素的严重影响，包括植入物的位置、关节内接触面积的变化、松质骨和/或软骨下板的弹性模量。实验观察到纤维包埋也降低了软骨应力升高效应，但后来的骨重塑和种植体包埋周围皮质壳的发展有助于重新提高局部软骨应力。
A finite element analysis was undertaken in concert with an animal model of mechanically-induced osteoarthritis. The numerical model was used to explore stress transmission anomalies associated with localized subchondral stiffening due to implantation of small cylindrical plugs immediately below the subchondral plate of sheep. The quasi-static, plane strain computational formulation included solution of the non-linear intra-articular contact problem, and was validated by comparison with a corresponding analytical solution and with the in vivo experimental results. Stress aberrations due to metal implant insertion were felt most greatly in the bone immediately surrounding the implant, but nominal compressive stress elevations up to about 50% could also be induced in the overlying deep hyaline cartilage layer. This localized cartilage stress elevation following the insertion of a metal plug could be seriously affected by a number of factors, including the positioning of the implant, variation in the area of intra-articular contact, or the elastic modulus of the cancellous bone and/or subchondral plate. Experimentally-observed fibrous encapsulation also reduced the cartilage stress elevation effect, but later bony remodeling and the development of a corticalized shell around the implant encapsulation served to re-elevate the local cartilage stresses.