Abstract
Most uncemented total hip replacements (THR) rely on press-fit for the initial stability and thus lead to the secondary fixation which is biological fixation. Choosing the accurate interference fit may have a great effect on implant stability and implant loosening prevention. Implant loosening is the most reported problem where it leads the increasing of micromotion at the bone-implant interface due to insufficient primary fixation. By having sufficient stability or fixation after surgery, minimal relative motion between the prosthesis and bone interfaces allows osseointegration to occur. Therefore, it will provide a strong prosthesis-to-bone biological attachment. The aim of this study was to evaluate the effect of bone-implant interface for uncemented hip implant. In this study, a three-dimensional model of hip implant was designed and analysed by using commercial Finite Element Software namely, ANSYS WORKBENCH V15 software in order to investigate the bone-implant interface effect using the chosen implant design. The value of interference fit (δ= 0.01, 0.05, 0.10 and 0.50 mm) and coefficient of friction (δ= 0.15, 0.40 and 1.00) were used to simulate the bone-implant interface. It was found that the interference fit of 0.50 mm was sufficient to achieve the primary fixation and also the best fitting; thus, the implant loosening can be minimized. The interference fit of 0.50 mm was the minimal value to achieve fixation, while the coefficient of friction did not affect the bone-implant interface.
Highlights
Introduction qualityTotal hip replacement has played an important role and continued to be a great remedy to overcome problems related to the human hip
This study demonstrated the consequence of the interference fit as it included only a small level of interference which changed the stability of the implant inside the cortical bone
When the diameter of the implant was increased to 14.05mm, the von Mises stress became stagnant or plateau as the load applied increased. This behaviour demonstrated that this interference fit is the minimal interference fit which has been suggested by Kadir et al where they stated that the optimal level of interference fit of around 50μm is sufficient enough to achieve the primary fixation [3]
Summary
Total hip replacement has played an important role and continued to be a great remedy to overcome problems related to the human hip. This surgery involve replacing the damaged upper end of thighbone or femur and hip socket in the pelvic bone with prosthetic implants. Many factors that leads to this replacement such as osteoarthritis, rheumatoid arthritis, avascular necrosis or even childhood hip disease. All of these diseases make the human hard to move their hip freely; human daily activities may interrupted and limited. The surgeon will give the suggestion to their patients regarding to their age, lifestyle, occupation and their bones’
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