Finite element analysis of the long-term fixation strength of cemented ceramic cups.

摘要: Clinical studies have shown that adequate fixation of ceramic cups using bone cement is difficult to achieve. As the cement-ceramic bond strength low, a satisfactory requires cup design allows mechanical interlocking, although such will probably promote cracking and therefore loosening in long term. An investigation has been carried out establish whether cemented can be designed way both initial obtained reduced levels found around PE functioning well vivo. By means finite element analysis, fatigue loading three geometrically different acetabular cups, with material properties, simulated, severity crack patterns produced analysed. Furthermore, analysed by simulating pull-out test prior after testing. All much larger amounts damage during testing than any cup, caused stress concentrations were attributable high stiffness ceramic. Even completely smooth more sharp-grooved cup. Owing excessive cracking, dropped loading. It concluded an increased risk long-term failure comparison combines sufficient low may