Frequencies of patients with RA and controls with grade ≥2 erosions and with erosions with the simultaneous presence of local inflammation in an MCP and/or MTP joint; analyses on person level
| Number of persons with erosions | Grade ≥2 erosions | Erosions with inflammation | ||||
| No grade ≥2 erosions | Grade ≥2 erosions | Erosion+ Inflammation− | Erosion+ Inflammation+ | |||
| RA | <40 years (n=33) | 14 | 11 (79%) | 3 (21%) | 3 (21%) | 11 (79%) |
| 40–59 years (n=96) | 39 | 34 (87%) | 5 (13%) | 16 (41%) | 23 (59%) | |
| ≥60 years (n=109) | 79 | 68 (86%) | 11 (14%) | 18 (23%) | 61 (77%) | |
| 238 | ||||||
| Control | <40 years (n=51) | 9 | 9 (100%) | 0 (0%) | 9 (100%) | 0 (0%) |
| 40–59 years (n=90) | 36 | 35 (97%) | 1 (3%) | 28 (78%) | 8 (22%) | |
| ≥60 years (n=52) | 36 | 35 (97%) | 1 (3%) | 21 (58%) | 15 (42%) | |
| 193 | ||||||
The presence of grade ≥2 erosions and erosions with inflammation (BME and/or synovitis) was evaluated per MCP and MTP bones according to the Rheumatoid Arthritis MRI Scoring System. Grade ≥2 erosions indicate that >10% of the bone is eroded. The presence of BME and/or synovitis was defined as a score of ≥1.
BME, bone marrow oedema; MCP, metacarpophalangeal joint; MTP, metatarsophalangeal joint; RA, rheumatoid arthritis.