Bilayered PLGA/PLGA-HAp Composite Scaffold for Osteochondral Tissue Engineering and Tissue Regeneration

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Osteochondral defects require advanced regenerative strategies.
• Biodegradable composite scaffolds offer promising solutions for bone and cartilage repair.

Purpose of the Study:

• To investigate the osteochondral regeneration potential of bilayered poly(d,l-lactide-co-glycolide)/poly(d,l-lactide-co-glycolide)-hydroxyapatite (PLGA/PLGA-HAp) composite scaffolds.
• To evaluate the efficacy of these scaffolds in a rabbit osteochondral defect model.

Main Methods:

• Fabrication of bilayered PLGA/PLGA-HAp scaffolds using compression molding/particle leaching and plasma treatment.
• Characterization of scaffold properties (pore morphology, mechanical strength, surface deposition).
• In vitro verification of mesenchymal stem cell (MSC) growth within scaffolds and in vivo testing in rabbit models.

Main Results:

• Scaffolds demonstrated suitable pore morphology and mechanical properties for tissue regeneration.
• Both virgin and MSC-preseeded PLGA/PLGA-HAp scaffolds promoted significant osteochondral repair at 16 weeks post-operation.
• Histological and biomechanical analyses confirmed bone and cartilage regeneration.

Conclusions:

• The bilayered PLGA/PLGA-HAp composite scaffold is a viable candidate for osteochondral tissue engineering.
• The scaffold may facilitate regeneration through in situ tissue induction by recruiting and differentiating local cells.