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A new hip fracture risk index derived from FEA-computed proximal femur fracture loads and energies-to-failure

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Abstract

Summary

Hip fracture risk assessment is an important but challenging task. Quantitative CT-based patient-specific finite element (FE) analysis (FEA) incorporates bone geometry and bone density in the proximal femur. We developed a global FEA-computed fracture risk index to increase the prediction accuracy of hip fracture incidence.

Purpose

Quantitative CT-based patient-specific finite element (FE) analysis (FEA) incorporates bone geometry and bone density in the proximal femur to compute the force (fracture load) and energy necessary to break the proximal femur in a particular loading condition. The fracture loads and energies-to-failure are individually associated with incident hip fracture, and provide different structural information about the proximal femur.

Methods

We used principal component analysis (PCA) to develop a global FEA-computed fracture risk index that incorporates the FEA-computed yield and ultimate failure loads and energies-to-failure in four loading conditions of 110 hip fracture subjects and 235 age- and sex-matched control subjects from the AGES-Reykjavik study. Using a logistic regression model, we compared the prediction performance for hip fracture based on the stratified resampling.

Results

We referred the first principal component (PC1) of the FE parameters as the global FEA-computed fracture risk index, which was the significant predictor of hip fracture (p-value < 0.001). The area under the receiver operating characteristic curve (AUC) using PC1 (0.776) was higher than that using all FE parameters combined (0.737) in the males (p-value < 0.001).

Conclusions

The global FEA-computed fracture risk index increased hip fracture risk prediction accuracy in males.

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Data Availability

The datasets analyzed during the current study are not publicly available. Requests for access to these datasets should be directed to the corresponding authors.

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Acknowledgements

The study was approved by the Icelandic National Bioethics Committee (VSN: 00-063) and the Data Protection Authority. The researchers are indebted to the participants for their willingness to participate in the study.

Funding

This study was supported by NIH/NIA R01AG028832 and NIH/NIAMS R01AR46197. The Age, Gene/Environment Susceptibility Reykjavik Study is funded by NIH contract N01-AG-12100, the NIA Intramural Research Program, Hjartavernd (the Icelandic Heart Association), and the Althingi (the Icelandic Parliament). H-WD was partially supported by U19 AG055373 and R01 AR069055. XC was funded by the Michigan Technological University Health Research Institute Fellowship program and the Portage Health Foundation Graduate Assistantship.

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Correspondence to Vilmundur Gudnason or Qiuying Sha.

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Cao, X., Keyak, J.H., Sigurdsson, S. et al. A new hip fracture risk index derived from FEA-computed proximal femur fracture loads and energies-to-failure. Osteoporos Int 35, 785–794 (2024). https://doi.org/10.1007/s00198-024-07015-6

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  • DOI: https://doi.org/10.1007/s00198-024-07015-6

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