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%)


aACW = anterior chest wall; AS = ankylosing spondylitis; MSJ = manubriosternal joint; nrSpA = nonradiographic axial spondyloarthritis; SClJ = sternoclavicular joint; SCoJ = sternocostal joint; SpA = spondyloarthritis. bBone marrow edema ACW and/or erosion ACW, fat infiltration ACW, synovitis SClJ, fusion MSJ. The number of patients with MRI-detected lesions in the entire ACW may be lower than the addition of patients with MRI changes of the three joints SClJ, MSJ and SCoJ, because some patients showed inflammation in more than one joint. Values are the number of subjects (percentage).

Weber et al. Arthritis Research & Therapy 2012 14:R3   doi:10.1186/ar3551

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