Comparison of Functionally Graded Hip Stem Implants with ‎Various Second-Generation Titanium Alloys

Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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JR_JACM-7-3_006

تاریخ نمایه سازی: 12 مرداد 1400

Abstract:

Total hip Arthroplasty (THA) is performed every year at a very high frequency to improve the quality of life of thousands of patients all over the globe. Nevertheless, the expected service life of such surgery remains unsuitable for patients under ۵۰ years old. This is mainly related to stress shielding and the potential adverse tissue reaction to some of the elements of the market-dominant implant materials. In this research, functionally graded (FG) implant designs of several titanium alloys layered with hydroxyapatite (HA) are proposed to provide lower implant stiffness compared to a solid stem to approach the requirements of human bone. Moreover, TNZT (Ti۳۵Nb۷Zr۵Ta), and TMZF (Ti۱۲Mo۶Zr۲Fe) second-generation titanium alloys are studied as a replacement for the famous Ti۶Al۴V alloy to avoid the adverse tissue reactions related to aluminum and vanadium elements. The different FG models are numerically tested using a ۳D finite element simulation after virtual implantation in a femur bone under the dynamic load of a patient descending stairs. In the numerical study, the variation in stress distribution and strain energy in a femur bone is assessed for different FG hip stems as well as the axial stiffness of the hip stems. Results indicated an increase in strain energy and von Mises stress in the cortical and cancellous bones using FG hip stems. Additionally, the axial stiffness is reduced for all FG hip stems relative to the commercial Ti۶Al۴V hip stem.

Keywords:

Functionally graded material (FGM) , Second generation Titanium alloys , Hip stem implant , Stress shielding , strain energy

Authors

Tawakol A. Enab

Production Engineering and Mechanical Design Department, Faculty of Engineering, Mansoura University, P.O. ۳۵۵۱۶ Mansoura, Egypt‎

Noha Fouda

Production Engineering and Mechanical Design Department, Faculty of Engineering, Mansoura University, P.O. ۳۵۵۱۶ Mansoura, Egypt

Ibrahim Eldesouky

Production Engineering and Mechanical Design Department, Faculty of Engineering, Mansoura University, P.O. ۳۵۵۱۶ Mansoura, Egypt‎

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