Characterization of new bone formation in gout: a quantitative site-by-site analysis using plain radiography and computed tomography

Table 5 Sites of NBF and other features of gout on CT.

	Distal interphalangeal joints	Proximal interphalangeal joints^a	Metacarpophalangeal joints	Carpal region	Radius and ulna
Spur	12.5 (21.1)	20.0 (22.7)	18.0 (25.5)	16.3 (26.6)	24.8 (32.9)
Osteophyte	23.1 (25.1)	41.0 (23.2)	24.5 (24.2)	33.1 (32.3)	27.5 (30.2)
Periosteal NBF	1.9 (6.1)***	6.0 (10.5)*	2.5 (5.5)**	9.4 (16.1)	16.3 (23.3)
Ankylosis	0.0 (0.03)	1.5 (3.7)	0.0 (0.0)	0.6 (2.8)	0.0 (0.0)
Sclerosis	18.1 (23.5)**	35.0 (25.2)	23.5 (25.8)*	30.6 (28.8)	41.3 (33.7)
Erosion	20.9 (22.6)*	35.8 (26.4)	26.5 (29.8)	29.4 (31.5)	41.3 (40.8)
Tophus	21.4 (26.7)*	39.3 (31.2)	34.0 (36.6)	29.4 (32.5)	41.3 (43.9)

^aIncludes IP joint of the thumb. *P < 0.05 compared with radius/ulna, **P < 0.01 compared with radius/ulna, ***P < 0.001 compared with radius/ulna. All P refer to Tukey's post hoc test. Data are expressed as a mean (standard deviation) percentage of sites per patient to account for the different number of joints at each site. CT, computed tomography; NBF, new bone formation.

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