Table 7.

Baseline frequencies of bone marrow lesions

N = 289			All knees		No ROA		ROA		P-value
			Frequency	Percent	Frequency	Percent	Frequency	Percent
Knee	Number of regions	0	65	22.5	48	37.2	17	10.6	0.0000
		1	39	13.5	26	20.2	13	8.1
		2	60	20.8	28	21.7	32	20.0
		3	55	19.0	18	14.0	37	23.1
		4	37	12.8	7	5.4	30	18.8
		5	18	6.2	2	1.6	16	10.0
		6 +	15	5.2	0	0.0	15	9.4
	Maximum score	0	65	22.5	48	37.2	17	10.6	0.0000
		1	91	31.5	44	34.1	47	29.4
		2	78	27.0	24	18.6	54	33.8
		3	55	19.0	13	10.1	42	26.3
MFTJ	Number of regions	0	187	64.7	106	82.2	81	50.6	0.0000
		1	44	15.2	15	11.6	29	18.1
		2	19	6.6	7	5.4	12	7.5
		3	18	6.2	1	0.8	17	10.6
		4 +	21	7.3	0	0.0	21	13.1
	Maximum score	0	187	64.7	106	82.2	81	50.6	0.0000
		1	51	17.6	15	11.6	36	22.5
		2	28	9.7	5	3.9	23	14.4
		3	23	8.0	3	2.3	20	12.5
LFTJ	Number of regions	0	221	76.5	114	88.4	107	66.9	0.0000
		1	30	10.4	12	9.3	18	11.3
		2	10	3.5	3	2.3	7	4.4
		3	13	4.5	0	0.0	13	8.1
		4 +	15	5.2	0	0.0	15	9.4
	Maximum score	0	221	76.5	114	88.4	107	66.9	0.0000
		1	32	11.1	13	10.1	19	11.9
		2	21	7.3	2	1.6	19	11.9
		3	15	5.2	0	0.0	15	9.4
PFJ	Number of regions	0	123	42.6	60	46.5	63	39.4	0.2901
		1	66	22.8	27	20.9	39	24.4
		2	71	24.6	30	23.3	41	25.6
		3 +	29	10.0	12	9.3	17	10.6
	Maximum score	0	123	42.6	60	46.5	63	39.4	0.2806
		1	88	30.4	37	28.7	51	31.9
		2	57	19.7	22	17.1	35	21.9
		3	21	7.3	10	7.8	11	6.9