Development and Validation of a Subject-specific Finite Element Model of the Pelvis: Assessment of Model Sensitvity
نویسندگان
چکیده
The objectives of this study were to: 1) develop and validate a realistic FE model of the pelvis using subject-specific bone geometry, location-dependent cortical thickness and trabecular bone elastic modulus, and 2) assess the sensitivity of FE predictions to assumptions in both assumed and measured model inputs. A finite element model of a cadaveric pelvis was created using subject-specific CT image data. The pelvis was loaded experimentally using a prosthetic femoral stem in a fashion that could be easily duplicated in the computational model. Cortical bone strains were monitored using rosette strain gauges in ten locations throughout the left hemi-pelvis. FE predictions were compared directly with experimental results for purposes of validation. Overall, FE predictions were consistent with experimental results. In addition, the results of the sensitivity study suggest that changes to cortical bone thickness had the largest effect on cortical bone strains. Deviations to all other material parameters had little effect on cortical strains.
منابع مشابه
Subject-specific finite element model of the pelvis: development, validation and sensitivity studies.
A better understanding of the three-dimensional mechanics of the pelvis, at the patient-specific level, may lead to improved treatment modalities. Although finite element (FE) models of the pelvis have been developed, validation by direct comparison with subject-specific strains has not been performed, and previous models used simplifying assumptions regarding geometry and material properties. ...
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