![]() Animals were killed at 25 and 40 days after fracture induction, and the fractures were assessed for bone mass and strength. The spatially averaged, temporally averaged intensity was set at 0.1 W/cm 2. Active ultrasound involved a 2-millisecond burst of 1.0-MHz sine waves repeating at 100 Hz. ![]() Each animal was treated unilaterally with active ultrasound and contralaterally with inactive ultrasound. Ultrasound therapy was commenced on the first day after fracture and introduced 5 days a week for 20 minutes a day. Bilateral midshaft femur fractures were created in 30 adult male Long-Evans rats. The aim of this study was to investigate the effect on fracture repair of ultrasound produced by a conventional therapeutic ultrasound unit as used by physical therapists. ![]() A recent novel application of ultrasound therapy is the treatment of bone fractures. ![]()
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