i would like to thank all the members of the scientific and industrial research center of iran who workedd reviewed many cases by the referee of this center so that the projects could actually be evaluated. thank you. thank you. as a point, we are going to go. stay healthy. in the next step, if you allow me , i would also like to thank professors mahi dori and dr. farahmand for their guidance. let me explain the patients there are those who need to replace the knee joint and in fact there are various prostheses in the market that offer different degrees of change . the right prosthesis for the patient must be selected by the surgeon. they need to be checked and a device is needed to calculate quantitatively and present the results to the surgeon in the form of a series of diagrams so that this operation can be done well and the prosthesis can be chosen better and the patient can more easily lead a lifestyle before knee joint replacement. we return the prosthesis at night for quality control the basis of the patient personalizes and presents propositions that he must choose, which is teste