Stage | Description |
I | Articular cartilage injury |
IIa | Cartilage injury with bony fracture and oedema (acute) |
IIb | Cartilage injury with bony fracture and oedema (chronic) |
III | Detached, non-displaced bony fragment with fluid rim beneath fragment |
IV | Displaced fragment, uncovered subchondral bone |
V | Subchondral cyst present |