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Time-dependent changes in dynamic mechanical properties of irradiated bone
Marcin Mardas1,2, Leszek Kubisz3, Piotr Biskupski4
1Department of Oncology, Poznan University of Medical Sciences, Poznan, Poland.
Bio-Medical Materials and Engineering
|September 26, 2015
Summary
Irradiated bone allografts show reduced mechanical stability, with lower critical points observed at lower radiation doses. A dose of 35 kGy appears optimal for ionizing radiation sterilization of bone allografts.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Radiation Sterilization
Background:
- Allograft tissue is increasingly used for musculoskeletal repair.
- Sterilization methods for allografts require rigorous safety and efficacy evaluation.
- Limited data exists on the long-term mechanical properties of irradiated bone allografts.
Purpose of the Study:
- To investigate the effects of varying doses of ionizing radiation on the mechanical properties of bovine bone allografts.
- To determine the optimal radiation dose for sterilization while preserving bone integrity.
Main Methods:
- Bovine femurs were machine-cut and irradiated at doses of 10, 15, 25, 35, 45, and 50 kGy.
- Dynamic mechanical analysis (DMA) was conducted using a 3-point bending test at 1 Hz and room temperature for 2880 minutes.
- A 'critical point' was introduced to analyze the time-dependent mechanical response.
Main Results:
- Final storage modulus (E') and loss modulus (E″) were dose-independent but reached at different time points.
- All irradiated groups exhibited a statistically significant lower 'critical point' compared to controls (p<0.05).
- The most significant reductions in the 'critical point' were observed at radiation doses of 10, 15, and 25 kGy.
Conclusions:
- Ionizing radiation affects the time-dependent mechanical properties of bone allografts.
- Lower radiation doses (10-25 kGy) result in more pronounced reductions in mechanical stability.
- A radiation dose of 35 kGy is suggested as the optimal balance for sterilization efficacy and preservation of mechanical integrity in bone allografts.
