期刊
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
卷 113, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmbbm.2020.104118
关键词
Partition of unity; PUFEM; XFEM; Cohesive traction separation law; Crack surface; Crack propagation
资金
- Swedish Foundation for Strategic Research [IB2013-0021]
- Swedish Research Council [2015-4795]
- Birgit and Hellmuth Hertz' Foundation
This study used a discrete damage approach to simulate the full fracture process in subject-specific femur models under stance loading conditions. The results illustrate the importance of implementing a subject-specific material distribution to accurately predict fracture patterns and bone strength. This study demonstrates how discrete damage models can provide a more complete picture of fracture risk by considering both bone strength and fracture toughness in a subject-specific fashion.
Hip fractures are a major health problem with high socio-economic costs. Subject-specific finite element (FE) models have been suggested to improve the fracture risk assessment, as compared to clinical tools based on areal bone mineral density, by adding an estimate of bone strength. Typically, such FE models are limited to estimate bone strength and possibly the fracture onset, but do not model the fracture process itself. The aim of this study was to use a discrete damage approach to simulate the full fracture process in subject-specific femur models under stance loading conditions. A framework based on the partition of unity finite element method (PUFEM), also known as XFEM, was used. An existing PUFEM framework previously used on a homogeneous generic femur model was extended to include a heterogeneous material description together with a strain-based criterion for crack initiation. The model was tested on two femurs, previously mechanically tested in vitro. Our results illustrate the importance of implementing a subject-specific material distribution to capture the experimental fracture pattern under stance loading. Our models accurately predicted the fracture pattern and bone strength (1% and 5% error) in both investigated femurs. This is the first study to simulate complete fracture paths in subject-specific FE femur models and it demonstrated how discrete damage models can provide a more complete picture of fracture risk by considering both bone strength and fracture toughness in a subject-specific fashion.
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