Studies on the biomechanical compatibility of hip-joint endoprostheses
|Bearbeitung:||Prof.Dr.-Ing. Udo Nackenhorst, M.Sc. Andre Lutz, ext. B. Ebbecke|
The standard treatments of diseased hip joints are total hip joint prosthesis (TEP), where for the femoral part usually stem prostheses are implanted. However, aseptic loosening of the stem-bone contact is an often long term complication for those devices. Thus, research is performed for alternatives, which also provide a good chance of revision, which is essential especially for younger patients. Computational bone remodelling simulation enables for pre operative studies on the biomechanical compatibility of different implant systems and opens a new strategy for optimized prosthesis design. A variety of different systems has been studied so far by use of the computational approach developed in the work group. Underlined by clinical observations these studies give clear hint on the long term progress of different systems.
Fig. 1: Bone remodelling caused by stress shielding from standard stem prosthesis. A significant loss of bone quality is observed along the whole length of the shaft.
Fig. 2: The computational results obtained for the "Spiron" system predict a quite good biomechanical compatibility of this prosthesis design.
Fig. 3: Quite good biomechanical compatibility has also been obtained for the "Mayo" prosthesis, depicted is the temporal development of average bone mass density.
Fig. 4: Resurfacing seems to be the most minimal invasive treatment. These figures depict