Self-organizing bioceramic granules with wave-dissipating architectures for bone void filling

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Regenerative Medicine

Background:

• Granular bone substitutes lack initial stability, leading to migration and complications.
• Wave-dissipating structures offer inherent architectural stability.
• Novel bioceramic granules inspired by wave-dissipating designs are needed for bone repair.

Purpose of the Study:

• To fabricate and evaluate wave-dissipating bioceramic granules for bone repair.
• To assess the impact of granule architecture on bone ingrowth and defect stability.
• To identify optimal granule designs for enhanced osteogenesis and bone regeneration.

Main Methods:

• Fabrication of wave-dissipating bioceramic granules using digital light processing-based 3D printing.
• Evaluation of six wave-dissipating designs (Tetrapod, Dolos, Hexaleg) for self-organization and stability.
• In vivo assessment of Tetrapod, Dolos, and Hexaleg granules in unhealed femoral defects.

Main Results:

• Tetrapod and Dolos designs self-organized into optimal architectures for bone ingrowth and stability.
• Hexaleg implantation resulted in loose filling and impaired bone remodeling.
• Tetrapod and Dolos implantations achieved stable defect filling, supported vascularization, and promoted high-quality new bone formation.

Conclusions:

• The self-organized architecture of granule packing is critical for bone regeneration, more so than individual granule properties.
• Tetrapod and Dolos bioceramic granules are promising bone void fillers.
• Wave-dissipating concepts provide structural stability and architectural cues for osteogenesis in bone defect repair.