Table I.

Criteria for scoring immunoreactivity in articular cartilage

Score	Criteria
	TIMP-1 and TIMP-3	SLPI	PAI-1	VEGF
0	No positive superficial chondrocytes	No positive superficial chondrocytes	No positive chondrocytes	No positive superficial chondrocytes
1	Some, but fewer than 10% of superficial chondrocytes positive	Fewer than 50% of superficial chondrocytes positive	Positive chondrocytes in the superficial zone	Positive chondrocytes in the superficial zone
2	Thin layer (up to three cells deep) of positive superficial chondrocytes	50% or more of the superficial chondrocytes positive	Positive chondrocytes in the superficial and intermediate zones	Positive chondrocytes in the superficial and intermediate zones
3	Thick layer (>3 cells deep) of positive superficial chondrocytes		Positive chondrocytes in the superficial, intermediate and deep zones