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A uniform strain criterion for trabecular bone adaptation: do continuum-level strain gradients drive adaptation?
C H Turner1, V Anne, R M Pidaparti
1Department of Orthopaedic Surgery, Indiana University Medical Center, Indianapolis, USA.
Journal of Biomechanics
|June 1, 1997
Summary
Trabecular bone density adapts to minimize strain gradients, ensuring uniform bone strain. This study validates a uniform strain hypothesis using finite-element analysis, supporting its role in bone adaptation.
Area of Science:
- Biomechanics
- Bone Physiology
- Computational Biology
Background:
- Trabecular bone exhibits complex adaptation patterns.
- Mechanosensitive cells (osteocytes, osteoprogenitors) influence bone remodeling.
- Strain gradients and fluid flow in bone marrow are implicated in adaptation.
Purpose of the Study:
- To test the hypothesis that trabecular bone adapts for uniform continuum-level strains.
- To investigate if this adaptation minimizes spatial strain gradients within the bone/marrow continuum.
- To evaluate the feasibility and accuracy of a uniform strain criterion in computational models.
Main Methods:
- Computational finite-element analysis (FEA) of the proximal femur.
- Modeling trabecular bone apparent density adaptation.
- Comparing predicted density distributions with experimental measurements.
Main Results:
- The uniform strain criterion yielded a realistic apparent density distribution in the proximal femur.
- Solutions for apparent density were convergent and unique.
- Predicted apparent densities closely matched experimental data.
- Significant reduction in strain gradients within the bone/marrow continuum was observed.
Conclusions:
- A uniform strain criterion is a feasible model for trabecular bone adaptation.
- Minimizing spatial strain gradients is a potential objective of bone adaptation.
- Mechanisms involving osteocytes, osteoprogenitor cells, and marrow fluid flow likely contribute to this adaptation.