Application of generative technologies in the design of reduced stiffness stems of hip joint endoprosthesis

This paper presents proposed new design solutions for hip endoprosthesis stems characterised by reduced stiffness as a result of application of internal lattice structures obtained using generative production techniques. The conducted analysis showed the possibility of achieving lattice structures inside implants as well as the possibility of controlling mechanical characteristics of the end forms of implants. It was demonstrated that the use of inner lattice structures resulted not only in reduced implant stiffness, but also in reduced formation of adverse cancellous tissue trabecular structures. The obtained results indicate that it is possible to obtain implant structures that are much less vulnerable to the stress shielding effect than traditional designs.