TABLE 1.
Grading of histologic indexes for cartilage regeneration.
| Histologic index | Grade 0 | Grade 1 | Grade 2 | Grade 3 |
|---|---|---|---|---|
| Tissue morphology |
Fibrous tissue (Poor quality repair tissue, characterizedby collagen fibers throughout the tissue and the presence of blood vessels) |
Fibrocartilage (Collagen fibers can be seen throughout the immature cartilage tissue) |
Mixed hyaline and fibrocartilage |
Hyaline cartilage (Good‐qualityrepair tissue, represented by homogeneous (glass‐like) tissue with no obvious collagen fibers) |
| Cell Morphology | Mostly spindle‐shaped cells | Both spindle‐shaped (dominant) and round/oval cells | Both spindle‐shaped and round/oval cells (dominant) | Mostly round/oval cells |
| Lacuna formation (%) | <25 | 25–50 | 51–75 | >75 |
| New vascularization (%) | <25 | 25–50 | 51–75 | >75 |
| Inflammation | None | Scant | Moderate | Abundant |