Cellular therapy and tissue engineering for cartilage repair.

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Orthopaedics

Background:

• Articular cartilage (AC) has a limited intrinsic repair capacity, necessitating advanced therapeutic strategies.
• Tissue engineering for cartilage repair has evolved significantly since 1977, with cell-based interventions now in clinical practice and others in development.

Purpose of the Study:

• To review current tissue engineering approaches for articular cartilage repair.
• To discuss challenges, advancements, and future directions in cartilage regeneration.
• To explore novel molecular therapies for enhancing endogenous repair mechanisms.

Main Methods:

• Review of literature on cell types (chondrocytes, mesenchymal stromal cells), scaffolds (natural, synthetic, multiphasic, scaffold-free), and advanced technologies (bioreactors, 3D bioprinting).
• Discussion of methods to improve cartilage properties, including mechanical stimulation, hypoxic culture, and growth factor stimulation.
• Analysis of recent findings on cellular and molecular mechanisms of cartilage repair.

Main Results:

• Various tissue engineering strategies, including scaffold-based and scaffold-free systems, offer potential for cartilage repair.
• Challenges remain in achieving zonal organization and seamless integration with host tissue.
• Advanced techniques and molecular therapies show promise for improving cartilage thickness, organization, and mechanical function.

Conclusions:

• A personalized approach is crucial, as a one-fits-all solution for articular cartilage repair is unlikely.
• Understanding underlying repair mechanisms is key to refining cell therapy and tissue engineering.
• Novel molecular targets are emerging to enhance the reparative potential of joint-resident stem and progenitor cells.