One way to vary the stiffness of the implant is the choose of the material. It must be ensured that the selected material not only provides the desired stiffness, but also guarantees the fulfilment of the function by sufficiently good mechanical characteristics. A material that meets the above-mentioned requirements is the
titanium aluminum alloy Ti6-4, which can be processed reliably by selective laser melting. A striking feature is the low Young’s modulus compared to other biocompatible metallic materials, which has a positive influence on the stiffness optimization of implants. The optimization process is carried out by systematically changing the cross-sectional profile of the hip prosthesis for stepwise stiffness adjustment. The result is a more homogeneously stressed bone contact surface, which allows a more extensive transfer of stress to the bone and reduces bone degradation due to stress shielding.