Table 1

Ultrasound, MRI, conventional radiography and clinical examination findings in the MRI-examined hand

Ultrasound (%)MRI (%)Conventional radiography (%)Clinical examination (%)
Bone erosions
 PIP joint (total)212911NA
  EOA31368NA
  Non-EOA5100NA
 DIP joint (total)526838NA
  EOA648958NA
  Non-EOA30300NA
Osteophytes
 PIP joint (total)54344144
  EOA53254230
  Non-EOA55504068
 DIP joint (total)75757171
  EOA81898369
  Non-EOA65505073
Synovitis*
 PIP joint (total)2016NANA
  EOA2519NANA
  Non-EOA1513NANA
 DIP joint (total)9.23NANA
  EOA1136NANA
  Non-EOA50NANA
Effusion
 PIP joint (total)7575NA30
  EOA7872NA32
  Non-EOA7080NA26
 DIP joint (total)5754NA4
  EOA5339NA6
  Non-EOA6580NA0
Bone marrow oedema
 PIP joint (total)NA39NANA
  EOANA36NANA
  Non-EOANA45NANA
 DIP joint (total)NA68NANA
  EOANA81NANA
  Non-EOANA45NANA
  • 56 Fingers (‘total’, 56 proximal interphalangeal (PIP) and 56 distal interphalangeal (DIP) joints) were examined. The distribution was as follows: 72 joints in erosive osteoarthritis (EOA; 36 PIP and 36 DIP joints) and 40 joints in non-EOA (20 PIP and 20 DIP joints). The imaging modalities were ultrasonography, MRI and conventional radiography.

  • * Synovitis by ultrasound = grey-scale synovitis; synovitis by MRI = above normal soft tissue enhancement.

  • NA, not applicable.