The application of the endoprosthesis on the thigh joint is one of the most frequent 10 operations performed in Germany in terms of prothesis [1]. There are a lot of technologies of producing of prothesis, which are different regarding material (alloy) from which the prosthesis is produced. Moreover, the structure of technological process, the ways of processing, using of the equipment, cutting (abrasive) tools and the regime of processing can be different as well.

The components of prosthesis are processed with the help of three axes lathes and 5 axes multitasked processing centers. Depending on regimes of cutting and instrumental material, the samples are received with different parameters of durability and corrosion stability.

Before using of the new material (a new combination of the materials) or a new technology of producing of the artificial thigh prosthesis it is necessary to carry out a great number of the experiments. In the special simulators given cycles of loading are applied to the prosthesis. After that, the durability is measured and the damage of the surface is analyzed.

The aim and problems of the measurements in the simulator:

- the micromovements are occurred in the head which lead to fretting corrosion and corrosion cleft;

- in order to compare different geometric options of the endoprosthesis such as different sizes of heads and shapes of the cones, it is desirable to have impression about micromovements;

- the exact dependence between the momentum of friction and wearing of the cone is still the subject of the exploration.

All modern thigh prosthesis of the thigh joint are not monolithic, they consist of many parts. The standard structure consists of three parts: the rod, the head (ball-shaped) and the cavity.

The research must be carried out in the places of joining of the components, because these places are epicenters of destruction and wearing.

The head and the rod are joined with the help of cone connection. The fretting corrosions has the biggest influence on destruction. Such kind of wearing occurs at relative moving of surfaces with amplitude from 0,025 mkm [1], which can be explained by destruction of the oxide pellicle in the points of moving contact. It is necessary to measure the values of microscopic relative movements which arise between the head and the rod in the process of cyclic loading in the simulator for defining of the fretting.

The imperfection of existing measurement systems for defining of influence of outcome factors of technology of producing of endoprosthesis on their durability and longevity is still a problem.

The aim of this work is increasing of the productivity of trials of the endoprosthesis on durability by means of improvement of a sensor system of the simulator.

The improvement of the sensor system of the simulator of the work of endoprosthesis of the thigh joint allowed to increase the productivity of the trials on durability of the prosthesis and raise the accuracy of the obtained results 1,7 times.