From: Ultrasonography of the metacarpophalangeal and proximal interphalangeal joints in rheumatoid arthritis: a comparison with magnetic resonance imaging, conventional radiography and clinical examination
Bone erosions on MRI
Bone erosions on CR
No bone erosions on MRI and CR
US grades
Grade 1 (n = 16)
2
0
14
Grade 2 (n = 55)
32
17
20
Grade 3 (n = 26)
18
6