. Author manuscript; available in PMC: 2014 May 1.

Published in final edited form as: Osteoarthritis Cartilage. 2013 Feb 18;21(5):695–699. doi: 10.1016/j.joca.2013.02.003

Table 1.

Compartmental prevalence (% of knees) of MRI-based definitions of structural damage (all knees, n=970)

	Prevalence (95% CI) of compartment involvement			p-value from Chi-square test
Definition	Isolated PFJ	Isolated TFJ	Mixed	PFJ vs. TFJ	PFJ vs. Mixed	TFJ vs. Mixed
1.Any cartilage damage	20.4(17.9,22.9)	10.4(8.5,12.3)	44.2(44.1,47.4)	<0.0001	<0.0001	<0.0001
2.Full- thickness cartilage damage	18.6(16.1,21.0)	8.0(6.3,9.8)	7.8(6.1,9.5)	<0.0001	<0.0001	0.86
3. Any BML	17.9(15.5,20.4)	16.5(14.2,18.8)	21.8(19.2,24.3)	0.4	0.04	0.003
4. Any cartilage damage + any BML	20.1(17.6, 22.6)	11.9(9.8, 13.9)	17.8(15.4, 20.2)	<0.0001	0.2	0.0002
5. Full- thickness cartilage damage + any BML	15.2(12.9,17.4)	8.8(7.0,10.5)	4.4(3.1,5.7)	<0.0001	<0.0001	0.0001

CI=Confidence Interval, PFJ=Patellofemoral joint, TFJ=Tibiofemoral joint, BML=Bone marrow lesion