Abstract
Wear is an important issue in hip implants. Excessive wear can lead to toxicity and other implant associated medical issues such as patient discomfort and decreased mobility. Since implant wear is the result of contact between surfaces of femoral head and acetabulum implant, it is important to establish a model that can address implant surface roughness interaction. A statistical contact model is developed for the interaction of femoral head and acetabulum implant in which surface roughness effects are included. The model accounts for the elastic-plastic interaction of the implant surface roughness. For this purpose femoral head and acetabulum implants are considered as macroscopically spherical surfaces containing micron-scale roughness. Approximate equations are obtained that relate the contact force to the mean surface separation explicitly. Closed form equations are obtained for hysteretic energy loss in implant using the approximate equations.
Highlights
Hip joint serves as one of the most important load bearing joints in human body
The design of hip joint implant needs to investigate all parameters such as wear, roughness, erosion, tribology, materials, and many problems caused by surgical procedure including bone replacement
This paper develops a statistically-based contact mechanics model of hip joint taking into account the effect of the surface roughness geometry of the implant
Summary
Hip joint serves as one of the most important load bearing joints in human body. Studies have shown that up to 5.5 times the bodyweight is tolerated by femur and pelvis during daily activities [1]-[3]. The design of hip joint implant needs to investigate all parameters such as wear, roughness, erosion, tribology, materials, and many problems caused by surgical procedure including bone replacement. Some of these factors have been studied since about 50 years ago. Brodner et al [22] investigated the levels of serum cobalt in patients before and after implantation of non-cemented total hip arthroplasties As a result, they show that the metal-on-metal prostheses produce detectable levels of serum cobalt in comparison with the ceramic-polyethylene prostheses as metal-on-metal prostheses generate some systemic release of cobalt. This paper develops a statistically-based contact mechanics model of hip joint taking into account the effect of the surface roughness geometry of the implant. The formatter will need to create these components, incorporating the applicable criteria that follow
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