Table 3 Frequency of MRI-detected lesions recorded concordantly by the majority of readers (at least four of seven) for each joint and per subjecta
Variables | SpA group (N= 122) | AS group (N= 95) | nrSpA group (N= 27) | Control group (N= 75) |
|---|---|---|---|---|
SClJ bone marrow edema | 29 (23.8%) | 26 (27.4%) | 3 (11.1%) | 1 (1.3%) |
SClJ erosion | 14 (11.5%) | 13 (13.7%) | 1 (3.7%) | 2 (2.7%) |
SClJ fat infiltration | 13 (10.7%) | 13 (13.7%) | 0 (0%) | 1 (1.3%) |
SClJ synovitis | 16 (13.1%) | 13 (13.7%) | 3 (11.1%) | 1 (1.3%) |
MSJ bone marrow edema | 41 (33.6%) | 35 (36.8%) | 6 (22.2%) | 6 (8.0%) |
MSJ erosion | 37 (30.3%) | 31 (32.6%) | 6 (22.2%) | 7 (9.3%) |
MSJ fat infiltration | 25 (20.5%) | 24 (25.3%) | 1 (3.7%) | 3 (4.0%) |
MSJ fusion | 14 (11.5%) | 14 (14.7%) | 0 (0%) | 0 (0%) |
SCoJ bone marrow edema | 8 (6.6%) | 8 (8.4%) | 0 (0%) | 0 (0%) |
SCoJ erosion | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) |
SCoJ fat infiltration | 4 (3.3%) | 4 (4.2%) | 0 (0%) | 0 (0%) |
ACW bone marrow edema (≥1 joint) | 54 (44.3%) | 47 (49.5%) | 7 (25.9%) | 7 (9.3%) |
ACW erosion (≥1 joint) | 42 (34.4%) | 35 (36.8%) | 7 (25.9%) | 9 (12.0%) |
ACW fat infiltration (≥1 joint) | 33 (27.0%) | 32 (33.7%) | 1 (3.7%) | 4 (5.3%) |
ACW ≥1 of 5 lesionsb (≥1 joint) | 72 (59.0%) | 62 (65.3%) | 10 (37.0%) | 15 (20.0%) |