Table 1.

Outerbridge grading for cartilage damage

Grade	Degree of chondral damage
0	Normal cartilage
1	Softening and swelling of cartilage
2	Partial-thickness defect with surface fissures
	NOT down to subchondral bone or greater than 1.5 cm in diameter
3	Fissures down to subchondral bone with a diameter greater than 1.5 cm
4	Subchondral bone exposed