Density-Dependent Material and Failure Criteria Equations Highly Affect the Accuracy and Precision of QCT/FEA-Based Predictions of Osteoporotic Vertebral Fracture Properties
| Autor: | Maria Prado, Hugo Giambini, Asghar Rezaei |
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| Rok vydání: | 2020 |
| Předmět: |
Accuracy and precision
0206 medical engineering Finite Element Analysis Biomedical Engineering Modulus 02 engineering and technology Models Biological Thoracic Vertebrae Elastic Modulus medicine Humans Quantitative computed tomography Elastic modulus Mathematics Aged Aged 80 and over Lumbar Vertebrae medicine.diagnostic_test business.industry Stiffness Structural engineering 020601 biomedical engineering Finite element method Biomechanical Phenomena Density dependent Fracture (geology) Spinal Fractures medicine.symptom business Tomography X-Ray Computed Algorithms Osteoporotic Fractures |
| Zdroj: | Annals of biomedical engineering. 49(2) |
| ISSN: | 1573-9686 |
| Popis: | About 700,000 vertebral fractures occur in the US as a result of bone loss. Quantitative computed tomography (QCT)-based finite element analysis (FEA) is a promising tool for fracture risk prediction that is becoming attractive in the clinical setting. The goals of this study were (1) to perform individual and pooled specimen optimization using inverse QCT/FEA modeling to obtain ash density-elastic modulus equations incorporating the whole vertebral body and accounting for all variables used during FE modeling, and (2) to determine the effect of material equations and failure criteria on the accuracy and precision of mechanical properties. Fifty-four (54) human vertebrae were used to optimize material equations based on experimental outcomes and, together with a previously proposed material equation, were implemented in our models using three different failure criteria to obtain fracture loads. Our robust QCT/FEA approach predicted 78% of the failure loads. Material equations resulted in poor accuracy in the predicted stiffness, yet yielded good precision and, more importantly, strong correlations with fracture loads. Both material and fracture criterion equations are equally important in estimating accurate and precise QCT/FEA predictions. Results suggest that both elastic modulus and fracture criterion equations should be validated against experimental outcomes to better explain the response of the tissue under various conditions. |
| Databáze: | OpenAIRE |
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