Reducing the stress shield in the femur using hip prostheses made of functionally graded materials

Document Type : Original Article

Authors

• Hastyar Jalilzadeh ¹
• Akbar Allahverdizadeh ²
• Behnam Dadashzadeh ²

¹ University of Tabriz

² Department of Mechatronics Engineering, University of Tabriz, Tabriz, Iran

10.22067/jacsm.2024.85554.1218

Abstract

Total hip joint replacement has problems, one of the most important of which is the stress shield phenomenon and weak bone growth. When the modulus of elasticity of the prosthesis is higher than that of the bone, most of the physiological load is transferred to the implant and the bone deteriorates. The solution to minimize it and strengthen bone growth is to use materials with elasticity modulus close to bone for prosthesis, and functionally graded materials (FGM) with porosity have shown better results than other materials. In this article, the model of cylinder and prosthesis based on ISO 7206-4 and the model of prosthesis and bone are used, and the results of applied stresses, stiffness of prostheses, and micromovements between prosthesis and bone are analyzed by the finite element method. The superiority of this study compared to previous studies is the use of prosthetic and cylinder models for different geometries and the investigation of micromovements and its effect on bone growth. The results show that the use of porous FGM prostheses for each different prosthesis geometry is effective in reducing the stress shield and bone growth.

Keywords

• Femoral prosthesis
• functionally graded materials
• porosity
• stress shielding
• finite element method
• micromotion

Main Subjects

• Bio mechanics

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