Osteoarthritis animal models for biomaterial-assisted osteochondral regeneration

Yi Wang, Yangyang Chen, Yulong Wei

Figure 5. Outerbridge arthroscopic grading system of articular cartilage defects. (A) Grade 0: normal cartilage; Grade I: nearly normal cartilage. (B) Grade II: partial thickness defect. (C) Grade III: full-thickness defect. (D) Grade IV: osteochondral defect.