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Outerbridge classification of rat knee joints.
| Outerbridge class | Pathological characteristics |
|---|---|
| 0 | Joint cartilage is light white, translucent, glossy, without cracks or erosions. |
| I | Joint cartilage is yellowish, with flat surface, and mostly without cracks or erosions. |
| II | Joint cartilage has visible cracks and erosions, and is thinner. |
| III | Joint cartilage is of a darker color and bears an obvious fracture with the lower layer. |
