| Dynamic Investigation of Interface Stress on Below-Knee Residual Limb in a Prosthetic Socket |
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| 作者姓名： | 贾晓红 张明 王人成 金德闻 |
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| 作者单位： | [1]DivisionofIntelligentandBiomechanicalSystem,StateKeyLaboratoryofTribology,TsinghuaUniversity,Beijing100084,China [2]JockeyClubRehabilitationEngineeringCenter,HongKongPolytechnicUniversity,HongKong,China |
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| 基金项目： | SupportedbytheNationalNaturalScienceFoundationofChina(No.50305013)
theResearchGrantCouncilofHongKong(No.PolyU5200/02E) |
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| 摘 要： | The dynamic effects of inertial loads on the interface stresses between a residual limb and the trans-tibial prosthetic socket were investigated. A 3-D nonlinear finite element model, based on the actual geometry of the residual limb, including internal bones and socket liner, was developed to study the mechanical interaction between the socket and the residual limb during walking. To simulate the friction/slip boundary conditions between the skin and liner, automated surface-to-surface contact was used. The results show that interface pressure and shear stress have a similar double-peaked waveform shape in the stance phase. The average difference in interface stresses between the cases with and without consideration of inertial forces is 8.4% in the stance phase and 20.1% in the swing phase. The results suggest that the dynamic effects of inertial loads on interface stress distribution during walking must be considered in prosthetic socket design.
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| 关 键 词： | 动态研究 界面压力 下肢 义肢 假肢槽 反胫骨 有限元分析 惯性载荷 |
Dynamic Investigation of Interface Stress on Below-Knee Residual Limb in a Prosthetic Socket |
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| JIA Xiaohong,ZHANG MingWANG Rencheng,JIN DewenDivision of Intelligent and Biomechanical System,State Key Laboratory of Tribology,Tsinghua University,Beijing ,China, Jockey Club Rehabilitation Engineering Center,Hong Kong Polytechnic University,Hong Kong,China.Dynamic Investigation of Interface Stress on Below-Knee Residual Limb in a Prosthetic Socket[J].Tsinghua Science and Technology,2004,9(6):680-683. |
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| Authors: | JIA Xiaohong ZHANG MingWANG Rencheng JIN DewenDivision of Intelligent and Biomechanical System State Key Laboratory of Tribology Tsinghua University Beijing China Jockey Club Rehabilitation Engineering Center Hong Kong Polytechnic University Hong Kong China |
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| Institution: | JIA Xiaohong,ZHANG MingWANG Rencheng,JIN DewenDivision of Intelligent and Biomechanical System,State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China, Jockey Club Rehabilitation Engineering Center,Hong Kong Polytechnic University,Hong Kong,China |
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| Abstract: | The dynamic effects of inertial loads on the interface stresses between a residual limb and the trans-tibial prosthetic socket were investigated. A 3-D nonlinear finite element model, based on the actual geometry of the residual limb, including internal bones and socket liner, was developed to study the mechanical interaction between the socket and the residual limb during walking. To simulate the friction/slip boundary conditions between the skin and liner, automated surface-to-surface contact was used. The results show that interface pressure and shear stress have a similar double-peaked waveform shape in the stance phase. The average difference in interface stresses between the cases with and without consideration of inertial forces is 8.4% in the stance phase and 20.1% in the swing phase. The results suggest that the dynamic effects of inertial loads on interface stress distribution during walking must be considered in prosthetic socket design. |
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| Keywords: | prosthetic socket interface stress finite element analysis inertial load dynamic effect |
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