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Progressive post-yield behavior of human cortical bone in compression for middle-aged and elderly groups
Huijie Leng1, X Neil Dong, Xiaodu Wang
1Department of Orthopaedics, Peking University Third Hospital, Beijing 100191, China.
Journal of Biomechanics
|January 20, 2009
Summary
Elderly bone shows faster modulus degradation and lower energy dissipation capacity compared to middle-aged bone under progressive loading, indicating increased fragility with age.
Area of Science:
- Biomedical Engineering
- Orthopedic Research
- Materials Science
Background:
- Bone fragility increases with age, impacting fracture risk.
- Understanding age-related changes in bone mechanical properties is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the compressive post-yield response of human cortical bone from middle-aged and elderly individuals.
- To assess age-related differences in modulus degradation, plastic deformation, viscous response, and energy dissipation.
Main Methods:
- A progressive loading regimen (load-dwell-unloading-dwell-reloading) was applied to human tibial cortical bone specimens.
- Specimens were from two age groups: middle-aged (53±2 years) and elderly (83±6 years).
- Modulus degradation, plastic deformation, viscoelasticity, and energy dissipation were quantified.
Main Results:
- Elderly bone exhibited faster modulus degradation with increasing strain compared to middle-aged bone.
- Modulus loss (microdamage) preceded plastic deformation in both groups.
- Middle-aged bone yielded at a greater strain and demonstrated significantly higher energy dissipation capacity across all pathways (elastic release, hysteresis, plastic).
Conclusions:
- Age-related differences in bone mechanics, particularly faster modulus degradation and reduced energy dissipation in the elderly, contribute to increased bone fragility.
- These findings provide insights into the mechanisms underlying age-associated bone susceptibility to fracture.
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