Low-Intensity Pulsed Ultrasound in Fracture Healing
Summary
Low-Intensity Pulsed Ultrasound (LIPUS) is a non-invasive mechanical therapy that delivers low-energy acoustic waves to fracture sites, stimulating biological processes that accelerate bone repair. Clinically established over three decades ago, LIPUS has been shown to enhance callus formation, increase mineral density and promote cellular signalling pathways critical for osteogenesis. At the tissue level, the ultrasonic pulses are thought to deform the extracellular matrix and activate integrin-mediated mechanoreceptors on osteoblasts and mesenchymal precursor cells. This leads to upregulation of cyclo-oxygenase-2 (COX-2), enhanced synthesis of growth factors such as vascular endothelial growth factor (VEGF), and recruitment of progenitor cells via chemokine gradients. In practical terms, daily 20-minute LIPUS regimens have been incorporated into treatment protocols for fresh fractures, delayed unions and non-unions, with evidence of reduced healing time and improved biomechanical integrity. Globally, LIPUS offers a portable, outpatient-friendly option that can complement surgical fixation or replace more invasive interventions in selected cases. Ongoing research explores optimal signal parameters, patient compliance factors and cost-effectiveness to broaden its application in orthopaedic practice.
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Low-Intensity Pulsed Ultrasound in Fracture Healing publication trend
The graph below shows the total number of articles in low-intensity pulsed ultrasound in fracture healing across all publications each year (not limited to Nature Index journals).
Technical terms
Low-Intensity Pulsed Ultrasound (LIPUS): A therapeutic modality delivering low-energy, pulsed acoustic waves to stimulate cellular and molecular processes in bone repair.
Callus: The provisional cartilaginous and bony tissue formed around fracture ends during the early stages of bone healing.
Delayed Union: A fracture that shows slower than expected progression toward healing but has not reached non-union criteria.
Mesenchymal Stem Cells (MSCs): Multipotent progenitor cells capable of differentiating into osteoblasts, chondrocytes and other lineages, essential for tissue regeneration.
Stromal Cell-Derived Factor-1 (SDF-1): A chemokine that binds CXCR4 on MSCs to direct their migration toward sites of tissue injury.
References
- Mode & mechanism of low intensity pulsed ultrasound (LIPUS) in fracture repair. Ultrasonics (2016).
- Low Intensity Pulsed Ultrasound Enhanced Mesenchymal Stem Cell Recruitment through Stromal Derived Factor-1 Signaling in Fracture Healing. PLOS ONE (2014).
- Improved healing response in delayed unions of the tibia with low-intensity pulsed ultrasound: results of a randomized sham-controlled trial. BMC Musculoskeletal Disorders (2010).
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