Animal models for cartilage repair

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Orthopedics

Background:

• Articular cartilage lesions, particularly full-thickness defects, pose significant clinical challenges due to the limited self-healing capacity and the formation of inferior fibrocartilage.
• Current therapeutic strategies, including bone marrow stimulation and tissue engineering approaches like matrix-induced autologous chondrocyte implantation (MACI), show limitations in fully restoring native hyaline cartilage function.
• Tissue engineering relies on cells, scaffolds, and signaling molecules, but in vitro validation is insufficient; in vivo studies are critical for assessing constructs.

Purpose of the Study:

• To review common preclinical animal models used in cartilage repair research.
• To highlight the importance of these models in understanding cartilage biology and developing new tissue engineering strategies.
• To analyze the peculiarities, advantages, and drawbacks of both small and large animal models for cartilage defect studies.

Main Methods:

• Review of existing literature on preclinical animal models for articular cartilage repair.
• Focus on models relevant to understanding cartilage biology and evaluating tissue engineering constructs.
• Comparative analysis of small and large animal models, considering cellular, biomaterial, and construct assessments.

Main Results:

• Preclinical animal models are indispensable for validating engineered cartilage constructs and understanding lesion mechanisms.
• In vivo studies must evaluate cellular phenotype, tumorigenicity, biomaterial biocompatibility, toxicity, degradation, and overall construct performance.
• Both small and large animal models offer unique advantages and disadvantages for studying cartilage regeneration.

Conclusions:

• Preclinical animal models are crucial for advancing cartilage tissue engineering and developing effective regenerative strategies.
• A thorough evaluation of cellular and biomaterial aspects within these models is essential for successful clinical translation.
• Understanding the specific benefits and limitations of various animal models will guide future research in cartilage repair.