Brand Richard A, Stanford Clark M, Swan Colby C
Department of Orthopaedic Surgery, The University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA.
Iowa Orthop J. 2003;23:13-22.
Joint implant design clearly affects long-term outcome. While many implant designs have been empirically-based, finite element analysis has the potential to identify beneficial and deleterious features prior to clinical trials. Finite element analysis is a powerful analytic tool allowing computation of the stress and strain distribution throughout an implant construct. Whether it is useful depends upon many assumptions and details of the model. Since ultimate failure is related to biological factors in addition to mechanical, and since the mechanical causes of failure are related to load history, rather than a few loading conditions, chief among them is whether the stresses or strains under limited loading conditions relate to outcome. Newer approaches can minimize this and the many other model limitations. If the surgeon is to critically and properly interpret the results in scientific articles and sales literature, he or she must have a fundamental understanding of finite element analysis. We outline here the major capabilities of finite element analysis, as well as the assumptions and limitations.
关节植入物的设计显然会影响长期效果。虽然许多植入物设计是基于经验的，但有限元分析有潜力在临床试验之前识别出有益和有害的特征。有限元分析是一种强大的分析工具，可计算整个植入物结构中的应力和应变分布。它是否有用取决于许多假设和模型细节。由于最终失效除了与机械因素有关外，还与生物学因素有关，并且由于失效的机械原因与载荷历史有关，而不是少数加载条件，其中主要问题是有限加载条件下的应力或应变是否与结果相关。新方法可以最大限度地减少这一点以及许多其他模型限制。如果外科医生要批判性地并正确地解释科学文章和销售文献中的结果，他或她必须对有限元分析有基本的了解。我们在此概述有限元分析的主要功能，以及假设和局限性。
