From: Are bone erosions detected by magnetic resonance imaging and ultrasonography true erosions? A comparison with computed tomography in rheumatoid arthritis metacarpophalangeal joints
Patients
Controls
Number
17
4
Sex (female/male)
13/4
3/1
Median age (years; range)
52 (33–78)
35.5 (34–57)
Median disease duration (years; range)
8 (4–22)
-
IgM rheumatoid factor (percentage seropositive)
82%