Multilayered Scaffold with a Compact Interfacial Layer Enhances Osteochondral Defect Repair.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Repairing osteochondral defects (OCDs) is challenging due to the complex stratified nature of cartilage and bone.
• Current biomaterials often fail to mimic the structural, biological, and mechanical properties of natural osteochondral tissue.

Purpose of the Study:

• To develop and evaluate a multilayered scaffold (MLS) that mimics the natural osteochondral tissue structure for OCD repair.
• To assess the efficacy of the biomimetic MLS in a goat model for regenerating hyaline-like cartilage and subchondral bone.

Main Methods:

• Fabrication of a multilayered scaffold (MLS) with hierarchical organization and heterogeneous composition.
• Evaluation of the MLS in a goat model for osteochondral defect repair.
• Macroscopic, histological, biomechanical, and biochemical assessments at 48 weeks postimplantation.

Main Results:

• The MLS group exhibited superior regeneration of hyaline-like cartilage and sound subchondral bone.
• Significant enhancement in biomechanical and biochemical properties of the newly formed osteochondral tissue was observed.
• The biomimetic design of the MLS facilitated integration and regeneration.

Conclusions:

• The developed multilayered scaffold (MLS) shows significant potential as an advanced strategy for osteochondral defect (OCD) repair.
• The biomimetic hierarchical structure and composition of the MLS are crucial for successful tissue regeneration.
• This optimized MLS offers a promising solution for restoring osteochondral function.