Articular Cartilage Repair and Regeneration Strategies

The avascular and alymphatic nature of articular cartilage renders it highly susceptible to degeneration and poor spontaneous repair following injury or in osteoarthritis. Traditional treatments such as microfracture rely on subchondral bone stimulation to recruit bone marrow–derived cells, resulting often in fibrocartilaginous repair with inferior mechanical properties. Advanced strategies have evolved to yield more hyaline-like tissue, including autologous chondrocyte implantation (ACI) and matrix-induced ACI, which expand patient-derived chondrocytes ex vivo and implant them within biocompatible scaffolds. Cell-based approaches also draw on mesenchymal stem cells (MSCs) sourced from bone marrow, adipose tissue or synovium, exploited for their chondrogenic potential under defined biochemical and mechanical cues. Scaffolds constructed from natural polymers such as collagen, hyaluronic acid or silk fibroin, and synthetic polymers like polycaprolactone, are tailored to provide structural support, guide cell organisation and deliver growth factors. Emerging methodologies encompass three-dimensional bioprinting to fabricate zonal constructs, hydrogel carriers for controlled release of transforming growth factor-β, and gene therapy vectors to modulate anabolic and catabolic pathways in situ. At the interface with subchondral bone, osteochondral grafts and calcium-phosphate composites address both cartilage and bony defects. The integration of bioactive materials, combinatorial cell and molecular therapies, and mechanical conditioning in bioreactors aims to regenerate durable, load-bearing cartilage. Global clinical trials are underway to translate such multimodal platforms into single-stage, off-the-shelf solutions, with the goal of restoring joint function, alleviating pain and delaying or obviating joint replacement surgery.

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Articular Cartilage Repair and Regeneration Strategies publication trend

The graph below shows the total number of articles in articular cartilage repair and regeneration strategies across all publications each year (not limited to Nature Index journals).

Technical terms

Chondrocyte: A specialised cell responsible for producing and maintaining the cartilaginous extracellular matrix, including collagen and proteoglycans.

Mesenchymal stem cell (MSC): A multipotent progenitor cell capable of differentiating into chondrocytes, osteoblasts and other mesodermal lineages under specific stimuli.

Scaffold: A three-dimensional structure composed of natural or synthetic biomaterials designed to support cell attachment, proliferation and tissue formation.

Extracellular matrix (ECM): The non-cellular network of proteins and polysaccharides that provides structural and biochemical support to surrounding cells in cartilage.

Allograft: A tissue graft sourced from a donor of the same species, processed for implantation to repair a defect in the recipient.

References

1. Cell Proliferation, Chondrogenic Differentiation, and Cartilaginous Tissue Formation in Recombinant Silk Fibroin with Basic Fibroblast Growth Factor Binding Peptide. Journal of Functional Biomaterials (2024).
2. Viable cartilage allograft outperforms existing treatments for focal knee cartilage defects. Knee Surgery, Sports Traumatology, Arthroscopy (2024).