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Apparent Young's modulus of vertebral cortico-cancellous bone specimens
F El Masri1, E Sapin de Brosses, K Rhissassi
1Arts et Metiers ParisTech, CNRS, LBM, 151 Boulevard de l'Hopital, 75013, Paris, France.
Summary
This study determined the apparent Young's modulus of vertebral bone using an inverse method. Results provide crucial mechanical data for finite element models of the entire vertebra.
Area of Science:
- Biomechanics
- Biomaterials Science
- Orthopedic Research
Background:
- Deriving subject-specific mechanical properties of the vertebral shell in vivo is limited by imaging resolution and cortical thickness.
- Accurate mechanical properties are essential for finite element modeling (FEM) of vertebrae.
Purpose of the Study:
- To assess the apparent Young's modulus of vertebral cortico-cancellous bone specimens.
- To establish a foundation for creating subject-specific FEM of entire vertebrae.
Main Methods:
- Harvesting 22 cortico-cancellous bone specimens from vertebral bodies.
- Performing compression testing until specimen failure.
- Utilizing an inverse method with a finite element model (FEM) and optimization to compute apparent Young's modulus.
Main Results:
- The mean apparent Young's modulus was 374 ± 208 MPa.
- The measured modulus ranged from 87 MPa to 791 MPa.
- Successfully computed apparent Young's modulus for the cortico-cancellous bone medium.
Conclusions:
- This study provides essential mechanical data for vertebral FEM.
- The computed apparent Young's modulus represents the combined properties of bone tissues in the vertebral shell.
- This method advances the development of more accurate vertebral biomechanical models.
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