We present a method to simulate acrylic bone cement damage accumulation around implants. The method combines the finite element method (FEM) with the theory of continuum damage mechanics (CDM). Damage was considered a tensorial variable, resulting in anisotropic material behavior when the material was damaged. The method was applied to an axi-symmetric structure, consisting of a taper pushed in a cement mantle. Varying the taper/cement interface conditions revealed that these had considerable effects on the damage process. Not only the mechanical endurance of the structure changed, but also the way in which damage progressed was affected. Two mesh densities were considered, to study the effects of mesh refinement. It was concluded that, although further research is required to obtain more realistic survival times, the method can be used on a comparative, qualitative basis. It predicts, pre-clinically, sites where cement damage is initiated, how this process progresses, and the effects of design parameters of implants on the mechanical endurance of the structure.
|Title of host publication||Computer methods in biomechanics and biomedical engineering|
|Editors||J. Middleton, M.L. Jones, G.N. Pande|
|Place of Publication||Amsterdam|
|Publisher||Gordon and Breach Science Publishers|
|Number of pages||570|
|Publication status||Published - 1996|
|Name||Computer methods in biomechanics and biomedical engineering|