Autogenous tissue-engineered cartilage: evaluation as an implant material

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Tissue Engineering

Background:

• Autogenous chondrocytes offer a promising source for cartilage repair.
• Biodegradable scaffolds are crucial for guiding tissue regeneration.
• Understanding the long-term behavior of engineered cartilage is essential.

Purpose of the Study:

• To assess the feasibility of creating shaped autogenous tissue-engineered cartilage grafts.
• To compare the histological and biomechanical properties of engineered cartilage with native cartilage.
• To evaluate the impact of repeated transplantation on engineered cartilage viability and function.

Main Methods:

• Autogenous chondrocytes were seeded onto polyglycolic acid-poly-L-lactic acid copolymer scaffolds in specific shapes.
• Grafts underwent short-term, long-term, or reimplantation in a rabbit model.
• Histological analysis, gross morphology assessment, and tensile strength testing were performed.

Main Results:

• Successful production of shaped tissue-engineered cartilage in 30 of 31 implants.
• Histology revealed mature cartilage matrix with significant vascular and fibrous tissue ingrowth.
• Long-term grafts showed osteoid formation; reimplanted grafts had compromised viability and reduced tensile strength compared to controls.

Conclusions:

• Predetermined shapes of autogenous tissue-engineered cartilage grafts are achievable.
• Engineered cartilage exhibits a composite structure with vascularization and delayed ossification.
• Graft viability and mechanical integrity are challenged by transplantation, indicating areas for future improvement.