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Nanoindentation of osteonal bone lamellae
Anna Faingold1, Sidney R Cohen, H Daniel Wagner
1Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel.
Journal of the Mechanical Behavior of Biomedical Materials
|April 14, 2012
Summary
Nanoindentation revealed variations in bone lamellar Young
Area of Science:
- Biomaterials Science
- Bone Biomechanics
- Materials Science
Background:
- Bone's microstructural complexity influences its mechanical properties.
- Osteons, the fundamental structural units of cortical bone, exhibit lamellar organization.
- Understanding the mechanical behavior of individual lamellae is crucial for bone mechanics.
Purpose of the Study:
- To measure Young's modulus variations in individual bone lamellae around an osteon.
- To correlate mechanical properties with the microstructure of osteonal lamellae.
- To investigate the anisotropic nature of bone lamellar mechanical properties.
Main Methods:
- Nanoindentation was employed to measure Young's modulus.
- Measurements were conducted in three orthogonal planes relative to the osteon axis (OA).
- Individual lamellae within a single bone osteon were analyzed.
Main Results:
- In planes perpendicular to the OA, the innermost lamella near the canal showed a higher modulus.
- No significant modulus difference was found in planes parallel to the OA.
- An asymmetry in modulus was observed in parallel planes, supporting the rotated plywood model.
Conclusions:
- Osteonal lamellae exhibit significant variations in Young's modulus.
- Most osteonal lamellae demonstrate structural anisotropy.
- Findings support the rotated plywood model for bone lamellar structure.
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