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Strain distribution within the human femur due to physiological and simplified loading: finite element analysis using the muscle standardized femur model

493003513 添加于 2014-10-29 10:11 | 1516 次阅读 | 0 个评论

作者
Polgar K, Gill HS, Viceconti M, Murray DW, O\'Connor JJ
摘要
The aim of the current work was to study the effect of simplified loading on strain distribution within the intact femur using the Muscle Standardized Femur finite element model and to investigate whether the interaction between the intact human femur and the muscles which are attached to the bone surface could accurately be represented by concentrated forces, applied through the centroids of their attachment areas. An instant at 10 per cent of the gait cycle during level walking was selected as the reference physiological load case; nine load cases were analysed. Comparison of the calculated results for the physiological load case with muscle forces uniformly distributed over their attachment areas showed good agreement with in vivo measurements of strain values and femoral head displacement in humans. Simplified load cases generated unrealistic displacement results and high strain magnitudes, exceeding the physiological range. It was found that when muscles with large attachment areas are included in the model and the muscle forces are simplified, stress and strain distributions will be affected not only on the external bone surface in the vicinity of the load application node, but also on the internal surface of the cortical bone. However, applying muscle forces as concentrated loads at the centroids of the attachment areas can serve as first indicators of the physiological stress and strain levels, if results from nodes and elements in the vicinity of the load application nodes are discarded. Omitting muscle forces or fixing the femur in mid-shaft leads to large unphysiological strain values.
详细资料
- 关键词: Compressive Strength; Computer Simulation; Computer-Aided Design/standards; Elasticity; Femur/*physiology; Finite Element Analysis; Humans; *Models, Biological; Motion; Muscle Contraction/*physiology; Muscle, Skeletal/*physiology; Reference Standards; Rotation; Sensitivity and Specificity; Stress, Mechanical; Tensile Strength; Thigh/physiology; Torque; Walking/physiology; Weight-Bearing/*physiology
- 文献种类: Journal Article
- 期刊名称: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
- 期刊缩写: Proc Inst Mech Eng H
- 期卷页: 2003年第217卷第3期 173-189页
- 地址: Oxford Orthopaedic Engineering Collaboration, Nuffield Department of Orthopaedic Surgery, University of Oxford, The Botnar Research Centre, Nuffield Orthopaedic Centre, Headington, Oxford, UK
- ISBN: 0954-4119
学科领域工程技术 » 机械工程
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