Abstract
The forces applied to the prosthesis during human activity produce dynamic stresses varying in time and may causing stress shielding in prosthesis-bone system. Therefore, it is important to reduce stress shielding effect. This study aimed to investigates, using finite element analysis, how a PEEK and carbon/ PEEK composite coating materials on a titanium alloy hip implant stem could reduce stress shielding effect corresponding to different human activities: standing up, normal walking and climbing stairs under dynamic loadings to find out which of all these models have a better performance. A 3D finite element model of femur, hip implants, coating layers with composite (carbon/PEEK) and polymeric (PEEK) coating materials were constructed for finite element analysis. A time-dependent cycling load was applied on the prosthesis head. The maximum increase in load transfer to the bone was 207% for the prosthesis coated with carbon/PEEK configuration I (fibers orientated with 0, +45, -45, and 90 degrees) in average compared to uncoated one. Numerical result showed that the carbon/PEEK composite material (configuration I) seems to be a good solution to distribute the applied load and transfer it to the bone, thus to reduce stress shielding problems and to prolong lifetime of the prosthesisbone system. It will prevent aseptic loosening and enhance the stability of the system
Highlights
Total hip replacement (THR) technique is considered as the most useful treatment option for osteoarthritis and rheumatoid arthritis on the hip joint, enabling the patients to recover painfree mobility [1,2]
The aim of this study is to investigates, using 3D finite element method, how a polyether ether ketone (PEEK) and carbon/PEEK composite coating materials on a titanium alloy hip implant stem could reduce stress shielding effect corresponding to different human activities: standing up, normal walking and climbing stairs under dynamic loadings to find out which of all these models have a better performance in the prosthesis-bone systems
From the finite element (FE) analysis, numerical results of maximum von Mises stress obtained for different hip implant stems were showed that 2 mm coating layer of PEEK or carbon/PEEK coating material have almost the same influence in decreasing maximum stress in hip implant stems in comparison with uncoated one
Summary
Total hip replacement (THR) technique is considered as the most useful treatment option for osteoarthritis and rheumatoid arthritis on the hip joint, enabling the patients to recover painfree mobility [1,2]. That is the reason THR attracted the interest of many specialists during the last decades. Hip implants are designed to last for 20 years at least, stress shielding might be increased by several problems causing failure. The most important factors are conflicts in physical properties of the implant and the body, biocompatibility and surgical procedures. The loads applied to the prosthesis during human activity produce dynamic stresses varying in time and may causing stress shielding in the prosthesis-bone system; it is important to reduce stress shielding effect
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