Abstract
Low-intensity whole-body vibration (LIWBV) may stimulate bone healing, but the involvement of vascular ingrowth, which is essential for bone regeneration, has not been well examined. We thus investigated the LIWBV effect on vascularization during early-stage bone healing. Mice aged 13 weeks were subjected to cortical drilling on tibial bone. Two days after surgery (day 0), mice were exposed daily to sine-wave LIWBV at 30 Hz and 0.1 g peak-to-peak acceleration for 20 min/day (Vib) or were sham-treated (sham). Following vascular casting with a zirconium-based contrast agent on days 6, 9, or 12 and sacrifice, vascular and bone images were obtained by K-edge subtraction micro-CT using synchrotron lights. Bone regeneration advanced more in the Vib group from days 9 to 12. The vascular volume fraction decreased from days 6 to 9 in both groups; however, from days 9 to 12, it was increased in shams, while it stabilized in the Vib group. The vascular volume fraction tended to be or was smaller in the Vib group on days 6 and 12. The vessel number density was higher on day 9 but lower on day 12 in the Vib group. These results suggest that the LIWBV-promoted bone repair is associated with the modulation of vascularization, but additional studies are needed to determine the causality of this association.





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Acknowledgements
The authors are indebted to Shota Sato (Osaka University Graduate School of Engineering Science) for his assistance with image processing and analysis. This work was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of the Japanese government (grant nos. 24650265 and 26282120). The synchrotron radiation experiments were performed at SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (proposal no. 2013A1667).
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Experiments were conducted in accordance with the guiding principles of the American Physiological Society and with the approval of the Animal Research Committee of Osaka University Graduate School of Engineering Science.
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Matsumoto, T., Goto, D. Effect of low-intensity whole-body vibration on bone defect repair and associated vascularization in mice. Med Biol Eng Comput 55, 2257–2266 (2017). https://doi.org/10.1007/s11517-017-1664-4
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DOI: https://doi.org/10.1007/s11517-017-1664-4