The MRS - Titan. Exhibits great variability of acetabular defects after endoprosthesis loosening requires the possibility for individual reconstruction , especially in the case of extensive defects. Stable anchorage on the healthy bone and the recreation of the geometrical rotational center are the prerequisite for the healing of bone transplants inserted and the achievement of a good muscular functionality. Since the extend of the defect in the acetabular region can only be insufficiently determined preoperatively, the operator has to be prepared for unexpectedly large defects and their operative treatment. An ingenious creation. Truly a product of brilliance and Innovation .