Racial differences in associations between baseline patterns of radiographic osteoarthritis and multiple definitions of progression of hip osteoarthritis: the Johnston County Osteoarthritis Project

Table 4 Adjusted odds ratios (aORs) for associations between patterns of JSN and progression

	rOA progression	ROM progression	THR	Disability progression	Any progression
JSN	(n = 411 hips)	(n = 404 hips)	(n = 12 hips)	(n = 445 participants)	(n = 1406 participants)
Any location	2.62 (1.95, 3.51)^a	1.31 (1.05, 1.63)	12.9 (1.63, 102)	1.06 (0.83, 1.36^b	1.20 (1.03, 1.40)
Axial	2.05 (1.44, 2.91)^a	1.30 (1.00, 1.68)	19.9 (2.50, 159)	0.86 (0.66, 1.12)	1.11 (0.92, 1.33)
Superior	2.75 (1.79, 4.24)^a	1.11 (0.81, 1.53)	1.78 (0.45, 6.99)	1.50 (1.07, 2.09)	1.42 (1.11, 1.82)
Medial	4.51 (1.47, 13.8)	0.68 (0.33, 1.40)	39.2 (7.91, 194)^a	1.40 (0.69, 2.88)	1.56 (0.76, 3.21)

All models were adjusted for age, gender, race, prior hip injury, body mass index, education, smoking and follow-up time; the progression of radiographic osteoarthritis (rOA) outcome was additionally adjusted for baseline Kellgren–Lawrence grade, while the disability outcome was also adjusted for the Center for Epidemiologic Studies Depression Scale. ^aStatistically significant after Bonferroni adjustment of p values. ^bSignificant interaction (p = 0.037) by race: for African Americans the aOR = 1.71, 95 % CI (1.06, 2.74), for Caucasians the aOR = 0.92, 95 % CI (0.68, 1.23). JSN joint space narrowing, ROM range of motion, THR total hip replacement

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