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Influence of the change in stem length on the load transfer and bone remodelling for a cemented resurfaced femur

493003513 添加于 2014-6-30 10:18 | 1148 次阅读 | 0 个评论

作者
Pal B, Gupta S, New AMR
摘要
The effect of a short-stem femoral resurfacing component on load transfer and potential failure mechanisms has rarely been studied. The stem length has been reduced by approximately 50% as compared to the current long-stem design. Using 3-D FE models of natural and resurfaced femurs, the study is aimed at investigating the influence of a short-stem resurfacing component on load transfer and bone remodelling. Applied loading conditions include normal walking and stair climbing. The mechanical role of the stem along with implant-cement and stem-bone contact conditions was observed to be crucial. Shortening the stem length to half of the current length (long-stem) led to several favourable effects, even though the stress distributions in the implant and the cement were similar in both the cases. The short-stem implant led not only to a more physiological stress distribution but also to bone apposition (increase of 20-70% bone density) in the superior resurfaced head, when the stem-bone contact prevailed. This also led to a reduction in strain concentration in the cancellous bone around the femoral neck-component junction. The normalised peak strain in this region was lower for the short-stem design as compared to that of the long-stem one, thereby reducing the initial risk of neck fracture. The effect of strain shielding (50-75% reduction) was restricted to a small bone volume underlying the cement, which was approximately half of that of the long-stem design. Consequently, bone resorption was considerably less for the short-stem design. The short-stem design offers better prospects than the long-stem resurfacing component.
详细资料
- 关键词: Biomechanical Phenomena; Bone Cements; Bone Density; Bone Remodeling/*physiology; Computer Simulation; Equipment Failure Analysis; Femur/*physiology/*surgery; Finite Element Analysis; *Hip Prosthesis; Humans; Models, Biological; Prosthesis Design; Prosthesis Failure; Stress, Mechanical
- 文献种类:期刊
- 期刊名称: Journal of Biomechanics
- 期刊缩写: J Biomech
- 期卷页: 2010年第43卷第15期 2908-2914页
- 地址: Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur 721 302, West Bengal, India
- ISBN: 0021-9290
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