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The University of Southampton

Research project: Modelling the mechanical behaviour of the interface between prosthesis and bone

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The integrity of the cement-bone interface is vital to the long-term stability of cemented arthroplasty. Although factors affecting the strength of the cement-bone interface are well documented, the actual behaviour and load-transfer across the interface at the trabecular level has historically been largely neglected. In addition, modelling of the cement-bone interface has mostly been limited to evaluation at the continuum level.

In this project, two modelling approaches were developed for the evaluation of the microstructural behaviour of the cement-bone interface: first, and most simply, the use of standardised unit-cells to represent the morphology of cancellous bone. Secondly, micro-Computed Tomography (CT) was used to build true models using micro finite element models. It was shown that the correlation of the volume segmented from CT images to the actual volume was vital for accurate calculation of the apparent level stiffness. Non-destructive testing including acoustic emissions were used to monitor the damage evolution of these specimens under loading, and predict the resulting performance numerically. This combination of computational and experimental methods has improved knowledge of the bone-cement interface at the microstructural level.

Modelling the Mechanical Behaviour

Related research groups

Bioengineering Science
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