Finite Element Modelling of a Total Wrist Implant
نویسندگان
چکیده
The aim of the project was to create finite element model of a commercially available wrist implant to examine its behaviour under loading. The finite element model was validated by carrying out mechanical tests. Little is known about the mechanics of wrist implants under loading and how they interact with the surrounding bone. Surgical outcomes have been poor and further research is needed to investigate the mechanical behaviour of the wrist implants under loading. A finite element model of the Universal 2 implant (Integra) was created using 3 dimensional scanning of the implant and a CAD model reverse engineered and inserted into a three dimensional model of the radius bone by using Mimics (Materialise). The implant consisted of 3 components: a proximal component made from CoCr alloy, a polyethylene spacer and a titanium distal component. The finite element modelling was carried out in Abaqus (Simulia) and solved using the implicit solver. Loading was applied to the distal component as surface pressure and the proximal end of the radius bone was fixed. Mechanical tests were carried out where the implant was fitted with strain gauges and loaded in uniaxial compression. The results showed good agreement between the FE model and the mechanical tests. Majority of the stresses were transmitted through the proximal stem and areas of reduced loading were seen in the bone. From the results it can be concluded that the design of the implant stem will have great effect on the stress distribution within the bone.
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