3D printed biomimetic PEEK/HA scaffolds induce cranial bone regeneration

Area of Science:

• Biomaterials Engineering
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Critical-sized cranial defects pose significant clinical challenges.
• Polyetheretherketone (PEEK) scaffolds have limitations including poor adaptability, bioinertness, and insufficient osseointegration.
• Improved biomaterials are needed for effective cranial defect repair.

Purpose of the Study:

• To fabricate a biomimetic Polyetheretherketone/hydroxyapatite (PEEK/HA) scaffold that mimics natural bone structure and composition.
• To evaluate the scaffold's potential for bone regeneration and osseointegration in critical-sized cranial defects.
• To address the limitations of current PEEK materials in clinical applications.

Main Methods:

• Fabrication of a biomimetic PEEK/HA scaffold using a 3D printing strategy.
• Characterization of the scaffold's structure, mechanical properties, and ion release (calcium and phosphate).
• In vitro co-culture studies with bone marrow mesenchymal stem cells (BMSCs) and in vivo evaluation in a rat critical-sized cranial defect model.

Main Results:

• The 3D printed PEEK/HA scaffold exhibited a stochastic lattice structure and bone-like mechanical properties.
• Sustained release of calcium and phosphate ions was observed.
• In vitro studies showed enhanced BMSC proliferation and osteogenic gene/protein expression.
• In vivo studies demonstrated significant bone regeneration and osseointegration in rat cranial defects.

Conclusions:

• The biomimetic PEEK/HA scaffold effectively promotes bone regeneration and osseointegration.
• This 3D printed scaffold offers a viable strategy for the repair and functional reconstruction of critical-sized cranial defects.
• The developed biomaterial overcomes limitations of traditional PEEK scaffolds, improving clinical outcomes.