Abstract
The paper presents the numerical analysis of stress and strain occurring in the most wearable parts of hip and knee joints endoprostheses. The complexity of the processes taking place in both, natural and artificial joints, makes it necessary to conduct the analysis on the 3D model based on already existing mathematical models. Most of the mechanical failures in alloplasty are caused by material fatigue. To cut down the risk of it, we can either increase the fatigue resistance of the material or decrease the load strain. It is extremelly important to indicate the areas where damage or premature wear may occur. The Finite Elements Method makes it possible to calculate the stress and strain in particular elements of the tested models. All presented numerical calculations define quality conclusions concerning the influence of some parameters of endoprostheses on the values of stress and strain that are formed in polyethylene parts of endoprotheses of hip and knee joints. The obtained results help to reveal “weak points” in examined models and thus, counteract the subsequent effects resulting from premature wear of endoprosthesis elements. The numerical analysis was performed basing on the finite elements method using Autodesk Simulation Mechanical 2017 software and the ADINA 7.5.1.
Highlights
The solutions used currently in endoprostheses have been focused on individual choice of the implant to suit the needs of patients
All the presented numerical computations allow for drawing valuable conclusions concerning the effect of selected functional parameters on the level of stresses and strains in individual components of the endoprosthesis [4, 5]
The analysis performed in the study revealed that the values of stresses and strains in the analysed system at the adopted load similar to that in natural conditions are low
Summary
The solutions used currently in endoprostheses have been focused on individual choice of the implant to suit the needs of patients. Apart from numerous opportunities for individualization, this solution allows for limitation of the extent of future revision joint surgeries. At the initial stage of the endoprosthesis design, one should use analytical solutions aimed to indicate the areas where damages or premature wear of the components are most likely to occur [1, 2, 3]. Most of mechanical damages in hip joint replacement are due to material. All the presented numerical computations allow for drawing valuable conclusions concerning the effect of selected functional parameters on the level of stresses and strains in individual components of the endoprosthesis [4, 5]. The presented numerical analysis is the most efficient and clearest method to define distribution of stresses and strains present in components of hip and knee joint endoprostheses
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