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Nanomechanical Properties of Rib Bones in Diabetic vs. Healthy Rat Models
Tamás Tarjányi1, Csaba Rosztóczy1, Ferenc Peták1
1Department of Medical Physics and Informatics, University of Szeged, 6720 Szeged, Hungary.
Nanomaterials (Basel, Switzerland)
|October 28, 2025
Summary
Diabetes mellitus significantly increases bone stiffness and brittleness, while aging affects its viscoelastic properties. This research highlights the need to evaluate bone quality beyond mineral density to understand fracture risks in aging and diabetic populations.
Area of Science:
- Biomaterials Science
- Skeletal Biology
- Nanomechanics
Background:
- Diabetes mellitus and physiological aging are known risk factors for bone fragility.
- Conventional bone densitometry may not fully capture the risk of fractures in these populations.
- Understanding the nanomechanical changes in bone due to diabetes and aging is crucial for developing targeted interventions.
Purpose of the Study:
- To investigate the distinct effects of diabetes mellitus and aging on the nanomechanical properties of rat rib cortical bone.
- To differentiate between disease-induced (diabetes) and age-related alterations in bone tissue quality.
- To establish a combined static and dynamic nanoindentation approach for assessing bone nanomechanics.
Main Methods:
- Utilized combined static and dynamic nanoindentation techniques on rat rib cortical bone.
- Analyzed bone samples from young control, old control, and streptozotocin-induced diabetic rats.
- Quantified intrinsic (static) and frequency-dependent (dynamic) mechanical properties, including hardness, elastic modulus, storage modulus, and loss modulus.
Main Results:
- Diabetic bone exhibited significantly higher hardness (0.47 GPa) and elastic modulus (9.53 GPa) compared to controls (0.11 GPa and 3.21 GPa, p < 0.001).
- The modulus-to-hardness ratio decreased in diabetics, indicating increased stiffness and brittleness.
- Aging primarily influenced storage and loss moduli (p < 0.001), suggesting alterations in viscoelastic damping, while diabetes predominantly affected intrinsic stiffness.
Conclusions:
- Diabetes mellitus stiffens bone tissue through matrix-level changes, increasing fracture risk.
- Physiological aging impacts the viscoelastic damping capacity of bone, affecting its response to mechanical load.
- The combined nanoindentation method effectively distinguishes between diabetes- and age-related bone degradation at the tissue level.
- Assessing bone quality via nanomechanics is essential for understanding fracture etiology in diabetic and elderly individuals.
