Finite Element Analysis of Bone for evaluation of the healing of a leg lengthening and evaluation of femoral stem design Thesis for the degree of Philosophiae Doctor Trondheim , May 2009
نویسنده
چکیده
Background: Determining the stability of a callus distraction is today largely based on measurement of bone density and qualitative evaluation of bone structure on plain radiographs. In the present study, we demonstrate how computed tomography (CT) and finite element (FE) models can be used together in a simple and effective manner to evaluate the healing of a leg lengthening. Method of Approach: CT scanning of a callotasis was performed two months before removal of external fixation and directly after removal of fixation. Two sections were modelled at each instance: the callotasis and a reference section below the distraction gap. Two density-stiffness relationships and two mesh refinements were analysed. Results: The FE analyses showed the estimates of compressive, torsional and bending stiffness to be very sensitive to the power term in the density-stiffness relationship. The stiffness of the callotasis increased from 3% to 19% and 15% to 44% relative to the reference section for a power of 3 and 1.5, respectively. The reference section also showed significant decrease in stiffness; 26% and 15% for a power of 3 and 1.5, respectively. Coarsening the mesh had little effect on the results, but improved computation time considerably. Conclusions: The study demonstrates the concept of using subject specific FE models to assess the stability of a callotasis. The models are simple to build, requiring only a few manual operations. The method could be used to get a more objective assessment of callotasis healing. 3.5.
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