Table 4.

Detailed MRI findings among the studied groups of patients.

MRI featureGroup 1 (UA) n = 25Group 2 (RA) n = 15Group 3 (SpA) n= 15
Mean synovial thickness, mm*4.33 ± 1.476.53 ± 2.163.03 ± 0.93
Cartilaginous erosions9 (36)12 (80)8 (53.3)
Bone erosions4 (16)13 (86.7)5 (33.3)
Soft tissue edema12 (48)14 (93.3)6 (40)
Bone marrow edema3 (12)13 (86.7)8 (53.3)
Enthesitis by MRI3 (12)0 (0)15 (100)
Baker’s cyst2 (13.3)12 (80)2 (13.3)
Mild knee effusion6 (24)1 (6.7)4 (26.7)
Moderate knee effusion8 (32)6 (40)9 (60)
Large knee effusion11 (44)8 (53.3)2 (13.3)
  • * Data are mean ± standard deviation. All other data are n (%). MRI: magnetic resonance imaging; UA: undifferentiated arthritis; RA: rheumatoid arthritis; SpA: spondyloarthropathy.