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Effects of acetabular resurfacing component material and fixation on the strain distribution in the pelvis

493003513 添加于 2014-10-18 15:02 | 1769 次阅读 | 0 个评论

作者
Thompson MS, Northmore-Ball MD, Tanner KE
摘要
A 3D finite element (FE) model of an implanted pelvis was developed as part of a project investigating an all-polymer hip resurfacing design. The model was used to compare this novel design with a metal-on-metal design in current use and a metal-on-polymer design typical of early resurfacing implants. The model included forces representing the actions of 22 muscles as well as variable cancellous bone stiffness and variable cortical shell thickness. The hip joint reaction force was applied via contact modelled between the femoral and acetabular components of the resurfacing prosthesis. Five load cases representing time points through the gait cycle were analysed. The effect of varying fixation conditions was also investigated. The highest cancellous bone strain levels were found at mid-stance, not heel-strike. Remote from the acetabulum there was little effect of prosthesis material and fixation upon the von Mises stresses and maximum principal strains. Implant material appeared to have little effect upon cancellous bone strain failure with both bended and unbonded bone-implant interfaces. The unbonded implants increased stresses in the subchondral bone at the centre of the acetabulum and increased cancellous bone loading, resembling behaviour obtained previously for the intact acetabulum.
详细资料
- 关键词: Acetabulum/physiopathology; Coated Materials, Biocompatible/chemistry; Computer Simulation; Equipment Failure Analysis/*methods; Femur/physiopathology; Finite Element Analysis; Gait/physiology; Hip/*physiopathology; *Hip Prosthesis; Humans; Leg Bones/*physiopathology; Muscle, Skeletal/physiology; Polyethylenes/*chemistry; Prosthesis Design/methods; Reproducibility of Results; Sensitivity and Specificity; Stress, Mechanical; Surface Properties; Weight-Bearing
- 文献种类:期刊
- 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: 2002年第216卷第4期 237-245页
- 地址: Department of Orthopaedics, Lund University Hospital, Sweden
- ISBN: 0954-4119
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