Finite Element Simulation of Osseointegration of Uncemented Endoprostheses
|Bearbeitung:||Prof. Dr.-Ing. U. Nackenhorst, M.Sc. André Lutz|
The term osseointegration means the ingrowth of bone into a porous coated implant. In order to simulate the osseointegration of bone implants, a bio-active interface theory is necessary. The thin bone-implant interface layer is described by a modified Drucker-Prager plasticity model. An evolution rule for the bone mineral density is formulated in dependency of the local mechanical environment. The time dependent ingrowth is modeled by a hardening rule which modifies the Drucker-Prager yield-surface cone in the principle stress state in dependency of the local bone mineral density. The osseointegration process is limited by the violation of a so called micromotion threshold. This relative motion in the implant-bone interface is computed by dynamic loads of daily motion activity.
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