Table 1.

Parameters included in semiquantitative histological analysis.

Category	Characteristic	Points
Tissue morphology	Mostly hyaline cartilage	3
	Mostly fibrocartilage	2
	Mostly noncartilage	1
	Noncartilage only	0
Matrix staining	Normal or near normal	3
	Moderate	2
	Slight	1
	None	0
Structural integrity	Normal	4
	Beginning of columnar organization	3
	No organization	2
	Cysts or disruptions	1
	Severe disintegration	0
Chondrocyte clustering	No clusters	2
	<25% of the cells	1
	25% to 100%	0
Formation of tidemark	Complete	4
	76% to 90%	3
	50% to 75%	2
	25% to 49%	1
	<25%	0
Subchondral bone formation	Good	2
	Slight	1
	No formation	0
Architecture of the surface	Normal	3
	Slight fibrillation or irregularity	2
	Moderate fibrillation or irregularity	1
	Severe fibrillation or disruption	0
Filling of the defect	91% to 100%	4
	76% to 90%	3
	51% to 75%	2
	26% to 50%	1
	<25%	0
Lateral integration	Bonded at both ends of graft	2
	Bonded at one end/partially bonded at both sides	1
	Not bonded	0
Basal integration	91% to 100%	3
	70% to 90%	2
	50% to 70%	1
	<50%	0
Inflammation	No inflammation	4
	Slight inflammation	2
	Strong inflammation	0