Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

FEM of contact stresses for different stem-surface-profiles and liner-cup-connection

Normally, the prosthetic femoral heads are coupled with the stems by means of a conical coupling.

It is important that after assembly the head subsequently remains immobile on the neck because the movement of the ceramic component on the metal taper of the stem will cause the metal component to wear. It is essential that the strength of the fixation between the head and the neck is sufficient to withstand the torque likely to be transmitted through the prosthesis in use.

The loads acting on the heads are often very high (even more then three times the body weight), cyclically variable.

Because of the characteristics of brittleness, ceramics don't allow any rate of local plastic deformation (possible with metals). It is therefore recommended to design a head-stem conic coupling in which the stress condition will never be critical for ceramic, to avoid the risk of breakage of the femoral head coupled with prosthetic acetabulum in the pelvis.

The purpose of this work is the optimisation of the coupling between neck and femoral head. In order to do that, FEM analysis performed with I-DEAS and MSC MARC software of the FGM ball head coupled with different stem tapers by incorporating the residual stresses calculated by HUT with ABAQUS software were done.

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