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Compressive fatigue behavior of bovine trabecular bone
M C Michel1, X D Guo, L J Gibson
1M.E. Mueller Laboratory of Biomechanics, University of Bern, Switzerland.
Journal of Biomechanics
|April 1, 1993
Summary
Bovine trabecular bone fatigue life strongly correlates with initial strain, ranging from 20 cycles at 2.1% strain to 400,000 cycles at 0.8% strain. Failure modes include brittle fracture and buckling, with local strain amplified at specimen ends.
Area of Science:
- Biomedical Engineering
- Materials Science
- Orthopedic Research
Background:
- Trabecular bone exhibits complex fatigue behavior crucial for skeletal integrity.
- Understanding fatigue mechanisms is vital for predicting bone failure under physiological loads.
Purpose of the Study:
- To investigate the fatigue behavior of bovine trabecular bone under controlled stress.
- To correlate fatigue life with initial strain and analyze failure modes.
Main Methods:
- Uniaxial compressive fatigue loading (2 Hz) of bovine trabecular bone specimens.
- Measurement of global and local strain distributions using photographic methods.
- Definition of failure as a 5% decrease in secant modulus.
Main Results:
- Fatigue life showed a strong correlation with initial maximum strain (r² = 0.78).
- Fatigue life ranged from 20 cycles (2.1% strain) to 400,000 cycles (0.8% strain).
- Two primary failure modes were observed: brittle transverse fracture and buckling-like failure.
Conclusions:
- Initial strain is a critical determinant of trabecular bone fatigue life.
- Failure mechanisms vary depending on trabecular orientation and applied strain.
- Modulus degradation patterns suggest contributions of creep and damage accumulation to fatigue failure.