Engineering injectable bone/bioadhesive grafts delivery system with self-healing properties for bone regeneration.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Open bone defects from high-energy injuries are increasing.
• Current bone grafting methods face challenges like dislocation and poor sealing.
• Bleeding and leakage complicate bone defect treatments.

Purpose of the Study:

• To develop an improved bone graft delivery system.
• To address limitations of current bone grafting techniques.
• To create a system with enhanced sealing, hemostatic, and drug-delivery capabilities.

Main Methods:

• Fabrication of micro-scale calf bone granules within a PEG-Gelatin bioadhesive matrix (Bi-PEG-SG).
• Evaluation of the system's self-healing, injectability, shape adaptability, adhesion, and bursting pressure.
• Assessment of sealing and hemostatic efficacy in bleeding models.
• Testing as a sustained-release carrier for vancomycin and bone morphogenetic protein-2.

Main Results:

• The developed system exhibited self-healing, injectability, shape adaptability, and high bursting pressure.
• Significant sealing and hemostatic capabilities were demonstrated in bleeding models.
• The system effectively delivered vancomycin and bone morphogenetic protein-2, showing antibacterial properties and enhancing osteogenesis.
• Promoted repair of bone defects.

Conclusions:

• The PEG-Gelatin bioadhesive calf bone granule system offers a promising solution for open bone defects.
• The system overcomes displacement issues and provides effective hemostasis.
• Its drug-eluting properties enhance bone regeneration and infection prevention.
• Represents a significant advancement in bone defect treatment strategies.