[Biomechanical substantiation of the form and position of endoprosthesis of the acetabular vault in dysplasia].

Many surgical methods have been suggested for the reconstruction of the vault of the acetabulum affected by dysplasia. However, the absence of the mathematical substantiation in most of them makes the choice of an optimal intervention difficult. In this paper a graphic analysis of the forces acting on the formed vault of the acetabulum is presented. It is demonstrated that the chosen pyramidal form and the position of the endoprosthesis are adequate to the pressure of the femoral head. The calculations that have out have been carried shown that the forces contributing to the consolidation of the whole construction act in the "endoprosthesis-hipbone" contract area. These mathematical prerequisites are the substantiation for the clinical application of such kind of endoprosthesis both for children and for adults with dysplasia of the vault of the acetabulum.