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The paper presents the numerical analysis of stress occurring in the most weara- ble parts of knee joint endoprostheses. That applies to the pair: sled - spherical insert. The Finite Elements Method makes it possible to calculate the stress in particular elements of the tested model. The interaction between the two parts of endoprosthesis takes place on a comparatively small contact surface. The Finite Elements Method (FEM) makes it possible to conduct a wide range of numerical analyses of strength with the usage of virtual models. As the method provides much more precise results than any simplified analytic calculations, it is commonly used in engineering calculations. Additionally, it is cheaper and easier in application than other experimental methods and furthermore faster in obtaining the results, which is critical in any real conditions. With FEM it is possible to define the values of stress in friction nodes of knee joint endoprostheses, regardless of the shape of sleds or polyethylene inserts, subjected to different loads. Therefore the stress and strain values distribution is clear and obtained quickly, even if there are many similar models of endoprostheses considered, without the necessity to bear the costs of constructing each of them separately; furthermore, it can quickly optimize construction.

Use of the Finite Element Method in the analysis of load of polyethylene inserts of knee joint endoprosthesis