Introduction to Animal Models of Knee Cartilage Injury

Knee joint cartilage injury animal models are a class of classic experimental systems used to mimic the clinical processes of articular cartilage defects, degeneration, and repair, and they are widely employed in research on osteoarthritis, cartilage regeneration, and tissue engineering. Modeling typically involves mechanical injury, drilling, abrasion, or full-thickness cartilage defect techniques to create standardized cartilage lesions in weight-bearing regions such as the femoral condyles or trochlear groove, thereby disrupting the structure and function of the articular cartilage. Because articular cartilage lacks blood vessels and nerves and exhibits limited self‑repair capacity, these models effectively replicate the pathological features of clinically observed cartilage injuries that fail to heal spontaneously.

Service Advantages of the Aniphe BioLab Animal Model Platform for Knee Joint Cartilage Injury

The Aniphe BioLab animal model platform for knee joint cartilage injury features a mature and robust cartilage defect‑creation technique, enabling precise control over the location and extent of the defect while ensuring model consistency and reproducibility.

	The modeling technique is well-established. Supports a variety of classic modeling approaches, including full-thickness cartilage defects and osteochondral defects, with high model stability.
	The model exhibits good consistency. Standardized control of defect location, depth, and area, with high inter-batch reproducibility.
	The evaluation system has been improved. The repair outcomes were assessed across multiple dimensions, integrating imaging findings, histopathology, and chondral repair scores.
	Quality System Standards Strictly adhere to SOPs and the QA management system to ensure that experimental data are authentic, complete, and traceable.
	Customized Service Support Modeling protocols, observation periods, and endpoint evaluation metrics can be designed according to project requirements.

Modeling cycle	4–12 weeks
Laboratory animals	SD/Wistar rats
Positive drug	There are three classes of conventional positive‑acting drugs: celecoxib, primarily used for anti‑inflammatory and analgesic effects and to improve lameness; diacerein, a disease‑modifying agent, mainly employed to inhibit IL‑1–mediated chondrocyte apoptosis and extracellular matrix degradation; and sodium hyaluronate, which is specifically indicated for intra‑articular injection as a local treatment to lubricate the joint and slow cartilage degeneration.
Application areas	It is widely used in research on the mechanisms of cartilage injury repair, investigations into the pathogenesis of osteoarthritis, and preclinical studies evaluating the in vivo efficacy of products such as cartilage repair materials, stem cell therapies, exosomes, biologics, and innovative drugs.

Construction of an Animal Model of Knee Joint Cartilage Injury

The femoral trochlear groove drilling model of cartilage injury is a classic, widely used experimental model in studies on knee joint cartilage repair. During model establishment, the knee joint of the experimental animal is exposed under anesthesia, and the weight-bearing region of the femoral trochlear groove is selected. A miniature bone drill or surgical burr is then used to create a circular defect with fixed diameter and depth; the lesion typically extends through the articular cartilage layer and can, depending on research requirements, be further extended into the subchondral bone. Following model creation, local pathological changes may include loss of the cartilaginous matrix, reduction in chondrocytes, and formation of reparative tissue, thereby effectively mimicking clinical traumatic cartilage defects. This model is characterized by its simplicity of operation, controllable defect size, and excellent reproducibility.