Biphasic mineralized collagen-based composite scaffold for cranial bone regeneration in developing sheep

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Cranial bone regeneration requires implants with mechanical support and osteogenic properties.
• Porous bone scaffolds aid bone healing but often lack sufficient mechanical strength for cranioplasty.
• Mineralized collagen scaffolds (MC) offer potential but require structural optimization.

Purpose of the Study:

• To develop and evaluate a biphasic mineralized collagen composite scaffold (bMC) for large cranial bone defect repair.
• To assess the mechanical support and osteogenic capability of the bMC scaffold in a preclinical sheep model.
• To determine the efficacy of bMC in promoting cranial bone regeneration and structural integrity.

Main Methods:

• Fabrication of a biphasic scaffold with a compact MC (cMC) supporting frame embedded in a porous MC (pMC) phase.
• Implantation of the bMC scaffold into large cranial bone defects in developing sheep.
• Evaluation using computed tomography, X-ray scanning, and histological analysis.

Main Results:

• The pMC phase was gradually replaced by new bone tissue, increasing bone mineral density and forming a complete bone bridge.
• The cMC frame provided mechanical support and promoted new bone formation without significant degradation.
• Sheep implanted with bMC showed improved survival, growth, and overall bone defect repair.

Conclusions:

• The biphasic structural design of the bMC scaffold successfully integrates mechanical support with osteogenic potential.
• bMC scaffolds represent a promising strategy for regenerating large cranial bone defects in cranioplasty.
• This approach may lead to a new generation of advanced materials for clinical bone defect repair.