| Site | Plain radiographic erosion | CT erosion | CT tophus* | CT intraosseous tophus |
| DIPJ, n = 159 | 51 (32.1%) | 33 (20.8%) | 41 (25.8%) | 27 (17.0%) |
| PIPJ/IPJ, n = 199 | 86 (43.2%) | 71 (35.7%) | 78 (39.2%) | 55 (27.6%) |
| MCPJ, n = 200 | 58 (29.0%) | 54 (27.0%) | 68 (34.0%) | 48 (24.0%) |
| Carpal bones, n = 160 | 41 (25.6%) | 47 (29.4%) | 47 (29.4%) | 39 (24.4%) |
| Radius/ulna, n = 80 | 34 (43%) | 32 (40%) | 33 (41%) | 25 (31%) |
| Total, n = 798 | 270 (33.8%) | 237 (29.7%) | 267 (33.5%) | 194 (24.3%) |
The number and percentage of joints affected by each abnormality is shown.
*Tophus adjacent to or within a joint on computed tomography (CT).
DIPJ, distal interphalangeal joint; MCPJ, metacarpophalangeal joint; PIPJ/IPJ, proximal interphalangeal joints and interphalangeal joints of the thumbs.