Table 2.

Summary of Magnetic Resonance Imaging Characteristics^a

	Preoperatively	Postoperatively	P Value
Articular cartilage Outerbridge grade, femur	1 (0-4)	1 (0-4)	.66
Articular cartilage Outerbridge grade, tibia	0 (0-2)	1 (0-3)	.15
Subchondral edema, femur	10 (23)	7 (16)	.59
Subchondral edema, tibia	16 (37)	9 (21)	.15
Insufficiency fracture, femur	5 (12)	0 (0)	.06
Insufficiency fracture, tibia	6 (14)	1 (2)	.11
Subchondral cysts, femur	0 (0)	5 (12)	.06
Subchondral cysts, tibia	0 (0)	0 (0)	≥.99
Subchondral collapse, femur	2 (5)	0 (0)	.49
Subchondral collapse, tibia	1 (2)	1 (2)	≥.99
Coronary/meniscotibial ligament abnormality	26 (60)	30 (70)	.50

^aDiscrete variables are reported as mean (range) and dichotomous variables as number (%).