• Bernd-Arno Behrens, Gabriele Helms, Olaf Pösse, Ingo Nolte, Andrea Meyer-Lindenberg, Pia Rittmann, Henning Windhagen, and Thomas Pressel.
• Institut für Umformtechnik und Umformmaschinen (IFUM), Leibniz Universität Hannover, Produktionstechnisches Zentrum Hannover (PZH), Garbsen, Deutschland.
• Biomed Tech (Berl). 2006 Dec 1;51(5-6):367-70.

AbstractThe implantation of a total hip prosthesis is an operation which is performed frequently due to advanced hip joint damage both in humans and in veterinary medicine in dogs. The long-term result of a hip prosthesis is mainly determined by aseptic loosening of the prosthesis; among other causes, abrasion particles of the tribological pairing are responsible for the loosening. For the analysis of the surface stresses with different tribological pairings, a finite element model was generated which was based on the CAD data of a commercial total hip prosthesis. After transmission of a physiological force in the components of the three tribological pairings ceramic/polyethylene, ceramic/ceramic and metal/polyethylene, stresses were calculated. Stresses in the ceramic/ceramic tribological pairings were conspicuously higher than in the other material pairings. In the future adapted prostheses have to be developed that ensure optimal friction and absorption characteristics of the components.

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