Katharina Immel

• Doctor of Engineering
• Scientific Coordinator at Forschungszentrum Jülich

Cementless implants are widely used in orthopedic and dental surgery. However, debonding-related failure still occurs at the bone–implant interface. It remains difficult to predict such implant failure since the underlying osseointegration phenomena are still poorly understood. Especially in terms of friction and adhesion at the macroscale, there i...

Primary stability of cementless implants is crucial for the surgical success and long–term stability. However, primary stability is difficult to quantify in vivo and the biomechanical phenomena occurring during the press–fit insertion of an acetabular cup (AC) implant are still poorly understood. The aim of this study is to investigate the influenc...

Cementless implants have become more and more common for joint replacement surgery. These implants achieve initial stability during surgery, while secondary stability is obtained by bone growing around and into the porous surface of the implant, a process called osseointegration. As debonding of the bone-implant interface due to aseptic loosening a...

Cementless implants have become widely used for total hip replacement surgery. The long-term stability of these implants is achieved by bone growing around and into the rough surface of the implant, a process called osseointegration. However, debonding of the bone–implant interface can still occur due to aseptic implant loosening and insufficient o...

While cementless implants are now widely used clinically, implant debonding still occur and is difficult to anticipate. Assessing the biomechanical strength of the bone–implant interface can help improving the understanding of osseointegration phenomena and thus preventing surgical failures. A dedicated and standardized implant model was considered...

Cementless implants have become more and more common for joint replacement and dental surgery. Initial stability is obtained during the surgery through a press fit process in the host bone, while long-term stability is obtained by bone growing around and into the porous surface of the implant, a process called osseointegration. As debonding of the...

This work presents a three-dimensional FE frictional contact formulation with NURBS-enriched contact elements for the debonding of partially osseointegrated, cementless implants. The contact model is based on a modified Coulomb's friction law [1] that can model the tangential debonding of partially osseointegrated implants. Here, a smooth transitio...

Cementless implants have become widely used for total hip replacement surgery. The long-term stability of these implants is achieved by bone growing around and into the porous surface of the implant, a process called osseointegration. However, debonding of the bone-implant interface can still occur due to aseptic implant loosening and insufficient...

Biomechanical phenomena occurring at the bone-implant interface during the press-fit insertion of acetabular cup implants are still poorly understood. This article presents a nonlinear geometrical two-dimensional axisymmetric finite element model aiming at describing the biomechanical behavior of the acetabular cup implant as a function of the bone...

Implant loosening is one of the major problems of cementless orthopedic and dental implants. However, the underlying phenomena of osseointegration, especially regarding frictional and adhesive effects at the interface and their influence on long term stability, remain poorly understood. Most numerical studies so far assume either a fully bonded int...

Cementless implants are widely used in orthopedic and oral surgery. However, debonding-related failure still occurs at the bone-implant interface. It remains difficult to predict such implant failure since the underlying osseointegration phenomena are still poorly understood. Especially in terms of friction and adhesion at the macro-scale, there is...