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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Finite Element Simulation of Osseointegration of Uncemented Endoprostheses

Bearbeitung:Prof. Dr.-Ing. U. Nackenhorst, M.Sc. André Lutz
Bild Finite Element Simulation of Osseointegration of Uncemented Endoprostheses

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.

Publikationen

Brinkmeier, M. and Nackenhorst, U. (2007): Basic Studies on the Dynamics of Rotating Cylindrical Structures,  Buchtitel: PAMM: Proc. Annual GAMM conference. Address: Zürich.

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