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This research is aimed at addressing the demand for segmental bone defect repair, and it has developed a biodegradable piezoelectric low-temperature gel scaffold based on the piezoelectric effect. This scaffold generates local electric potential and releases bioactive ions under physiological loads, thereby establishing a dynamic self-powered regenerative microenvironment. In vitro experiments have confirmed that the scaffold can regulate the behavior of stem cells and angiogenesis. In vivo experiments have successfully completed bone reconstruction in segmental radial bone defects, providing a new material concept for bone defect repair.
01 Research Background
Segmental bone defects (such as radial bone defects) are the core challenge in bone regeneration in orthopedics. The spontaneous healing of the defect area is extremely difficult. Existing bone repair grafts generally have complications at the donor site, immune rejection risks, and problems such as insufficient mechanical support and weak biological activity, which cannot meet the regeneration requirements for large bone defects.
02 Main Content
The research developed a degradable piezoelectric low-temperature gel scaffold composed of gelatin methacryloyl and piezoelectric Whitlock nanoparticles; tested the ability of the scaffold to generate electrical signals and release bioactive ions under physiological mechanical stimulation; conducted in vitro cell experiments to explore the regulatory effects of the scaffold on bone marrow mesenchymal stem cells and endothelial cells; used a rat radial segmental defect model to evaluate the bone regeneration and vascularization effects of the scaffold in vivo.
03 Research Design
The PWH gel scaffold was constructed using gelatin methacryloyl as the base and embedding piezoelectric Whitlock nanoparticles; the piezoelectric property was utilized to generate local electric potential and release Ca²⁺ and Mg²⁺ under physiological loads; in vitro experiments tested the proliferation, migration, osteogenic differentiation, and cytoskeleton remodeling of stem cells, as well as the formation of endothelial tubes; in vivo experiments used a critical radial bone defect model in rats to evaluate bone bridging, bone tissue morphology, and vascularization at the defect site.
04 Results
In vitro, the scaffold significantly promoted the proliferation, migration, and osteogenic differentiation of bone marrow mesenchymal stem cells, facilitating the formation of endothelial tubes, triggering piezoelectric 1-mediated calcium ion influx and remodeling of the cytoskeleton; after implantation in vivo, it achieved complete bone bridging at the defect site, effectively increasing bone volume, optimizing bone trabecular structure, and promoting vascularization in the defect area.
05 Extension of Ideas
Based on the synergistic mechanism of the piezoelectric effect and the release of active ions, the scaffold components and microstructure can be optimized to adapt to different bone defect repair scenarios; further exploration of the interaction mechanism between electrical signals, ionic signals, and bone regeneration cells can improve the design theory of electroactive bone materials; the multi-signal synergy strategy can be extended to more bone tissue regeneration fields, enriching the research paths for bone repair material development.
Source:
1. Journal: Bioactive Materials
2. Publication Date: February 27, 2026
3. DOI: 10.1016/j.bioactmat.2026.02.
