Uncemented Total Hip Replacement Stem Loosening after Long Term Compressive Stress Application : A Simulated FEA Study of Cortical Bone Remodeling(<Special Issue>Bioengineering)

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概要

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• The purpose of this study is to predict with the use of FEA, the differing predisposition to cortical bone resorption and subsequent distal migration of an un-cemented femoral hip replacement stem subjected to long term biomechanical high compressive stresses, while varying the load angles, the material properties of the stem, and the stem length. A twodimensional hip model was constructed to estimate the minimum principle stresses (P_3) and migration magnitudes. Bone remodeling at the interface between the bone and the prosthesis was performed by comparison of the local compressive stress to physiological stress values governing bone resorption. With respect to load angles, migrations of the hip prosthesis did not occur with load angles between 63° and 74° load angle in relation to the longitudinal axis of the bony femur, as the compressive stress generated on the cortical bone was under the criteria threshold for bone resorption (-50MPa). In addition, the magnitude of migration (17% decrease) was relatively more sensitive to changes in stem length than those (92% decrease) of changes of material properties. In conclusion, using an FEA model for bone remodeling, based on the high compressive stresses exerted on distal cortical bone, it is possible to estimate migration magnitudes of cementless hip prostheses in the long term. The load angles have been shown to be an important parameter affecting the migration magnitudes and furthermore, it can be demonstrated that the stiffer materials and reduction of stem length can decrease the migration of cementless hip prosthesis in the long term.

• 一般社団法人日本機械学会の論文
• 2004-12-15

著者

• SEKEL Ron

  Department of Orthopaedics, St. George Hospital, University of New South Wales

• Sekel Ron

  Department Of Orthopaedics St. George Hospital University Of New South Wales

• TSUTSUMI Sadami

  Department of Medical Simulation Engineering, Institute for Frontier Medical Science, Kyoto Universi

• IKEUCHI Ken

  Department of Neurology, Brain Research Institute, Niigata University

• Ikeuchi Ken

  Department Of Mechanical Engineering Faculty Of Engineering Kyoto University

• Jung Duk-young

  Department Of Medical Simulation Engineering Research Center For Nano Medical Engineering Institute

• NAKAI Ryusuke

  Department of Medical Simulation Engineering, Research Center for Nano Medical Engineering, Institut

• Nakai Ryusuke

  Department Of Medical Simulation Engineering Research Center For Nano Medical Engineering Institute

• Tsutsumi Sadami

  Department Of Medical Simulation Engineering Research Center For Nano Medical Engineering Institute

• Ikeuchi K

  Department Of Nano Biomechanism Research Center For Nano Medical Engineering Institute For Frontier

• Tsutsumi Sadami

  Department Of Medical Simulation Engineering Institute For Frontier Medical Science Kyoto University

• Jung Duk-young

  Department Of Chemistry-bk21 And Institute Of Basic Sciences Sungkyunkwan Advanced Institute Of Nano

• IKEUCHI Ken

  Department of Clinical Engineering, Suzuka University of Medical Science

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