Low-intensity pulsed ultrasound accelerates rat femoral fracture healing by acting on the various cellular reactions in the fracture callus

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
Yoshiaki AzumaS Jingushi

Abstract

Low-intensity pulsed ultrasound (LIPUS) has been shown to accelerate fracture healing in both animal models and clinical trials, but the mechanism of action remains unclear. In fracture healing, various consecutive cellular reactions occurred until repair. We investigated whether the advanced effects of LIPUS depended on the duration and timing of LIPUS treatment in a rat closed femoral fracture model to determine the target of LIPUS in the healing process. Sixty-nine Long-Evans male rats that have bilateral closed femoral fractures were used. The right femur was exposed to LIPUS (30 mW/cm2 spatial and temporal average [SATA], for 20 minutes/day), and the left femur was used as a control. Rats were divided into four groups according to timing and duration of treatment (Ph-1, days 1-8; Ph-2, days 9-16; Ph-3, days 17-24; throughout [T], days 1-24 after the fracture). Animals were killed on day 25. After radiographs and microfocus X-ray computed tomography (muCT) tomograms were taken, the hard callus area (HCA), bone mineral content (BMC) at the fracture site, and mechanical torsion properties were measured, and histological analysis was conducted. Interestingly, the maximum torque of the LIPUS-treated femur was significantly grea...Continue Reading

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