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Changes of cortical bone pores structure and their effects on mechanical properties in tail-suspended rats

Medicine in Novel Technology and Devices 2022年第4期16卷 220-227页

作者： Shouhui Wang Xiao Yang Zhuang Han Xintong Wu Yu-Bo Fan Lian-Wen Sun Key Laboratory for Biomechanics and Mechanobiology(Beihang University) Ministry of EducationBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100083China

Cortical bone is the main mechanical bearing structure of bone,and the mechanical properties of materials are not only related to bone mineral density,but also largely depend on its pores microstructure which affected by blood ***,the change of pores structure in cortical bone under microgravity was still *** this study,in order to clear the changes of pore structure with cortical vascular pores and its effect on bone mechanical properties,rat tail-suspension was used to simulate microgravity and the changes of the microstructure in rat tibia cortices were investigated by high-resolution micro-CT(3μm)while the bone mechanical properties were measured via three point bending *** results showed the bone mineral density of cortical bone didn't change in tail-suspended ***,the pore structure of cortical bone in tail-suspended rats changed significantly,the proportion of pores greater than 15μm(cortical vascular pores)increased while that less than 15μm *** mechanical properties of bone(such as maximum load and maximum stress)in tail-suspended rats *** the volume ratio of pore vessels(vessel volume/tissue volume)was negatively correlated with the mechanical *** conclusion,the increase of cortical vascular pores in rats caused by the simulated microgravity contributes to the decrease of mechanical properties.

关键词： pores microstructure Cortical vascular pores Bone loss Microgravity

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