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ISSN 1561-3011 (Electronic)

2015, Number 2

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Rev Cubana Invest Bioméd 2015; 34 (2)

Considerations about the definition of a patient specific model of the tibia

González CRA, Ortiz PA, Jacobo AVH, Cisneros HYA, Morales AL

Language: Spanish
References: 20
Page: 157-167
PDF size: 297.69 Kb.


ABSTRACT

Introduction: finite element analysis is used to understand and predict biological processes. In orthopedic biomechanics patient specific models are generated by computed tomography and used for medical decision making. Some corrective orthopedic processes may be simulated by means of finite element analysis. In order to obtain reliable biomechanical models it is highly advisable to reduce the number of errors in the definition of the model during pre-processing of the finite element analysis.
Objective: analyze the influence of mesh density and mechanical properties on the results obtained by finite element analysis during the stage of definition of the patient specific model.
Methods: the finite element method was used to simulate tibial compression. The geometry of the patient’s tibia was generated by computed tomography. Meshes were used with non-uniform and uniform element sizes. Homogeneous and nonhomogeneous mechanical properties were applied to the model.
Results: low-order elements converge to the solution. Tensions for meshes with these elements are lower than those for meshes with uniform size and high-order elements. On the other hand, non-homogeneous mechanical properties reduce the difference in the estimation of tensions.
Conclusions: to obtain reliable patient specific models it is recommended to generate the bone geometry with softened surfaces, control the quality of the surface mesh, use non-homogeneous mechanical properties, and use the mesh generated directly on Abaqus with low-order elements and non-uniform size.


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