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Table 3 Agreements between US, MRI, and x-ray for bone changes

From: Ultrasonography, magnetic resonance imaging, radiography, and clinical assessment of inflammatory and destructive changes in fingers and toes of patients with psoriatic arthritis

  US1 versus US2 US versus MRI US versus x-ray MRI versus x-ray
Bone erosions     
   MCP joint (total) 95%; κ = 0.795 87%; κ = 0.504 89%; κ = 0.268 89%; κ = 0.470
PsA 95%; κ = 0.830 85%; κ = 0.547 88%; κ = 0.358 85%; κ = 0.492
RA 88%; κ = 0.600 85%; κ = 0.318 83%; κ = NA 90%; κ = NA
CTRL 100%; κ = NA 95%; κ = NA 95%; κ = NA 100%; κ = NA
   PIP joint (total) 86%; κ = 0.522 86%; κ = 0.296 87%; κ = 0.361 92%; κ = 0.292
PsA 83%; κ = 0.526 85%; κ = 0.400 85%; κ = 0.411 88%; κ = 0.160
RA 100%; κ = NA 90%; κ = NA 93%; κ = 0.375 95%; κ = 0.643
CTRL 88%; κ = NA 85%; κ = NA 88%; κ = NA 100%; κ = NA
   DIP joint (total) 100%; κ = 1.000 96%; κ = -0.015 96%; κ = 0.506 96%; κ = 0.481
PsA 100%; κ = 1.000 93%; κ = -0.026 93%; κ = 0.527 93%; κ = 0.467
RA 100%; κ = NA 100%; κ = NA 100%; κ = NA 100%; κ = NA
CTRL 100%; κ = NA 100%; κ = NA 100%; κ = NA 100%; κ = NA
   MTP joint (total) 90%; κ = 0.702 - 89%; κ = 0.259 -
PsA 90%; κ = 0.799 - 89%; κ = 0.378 -
RA 100%; κ = 1.000 - 78%; κ = -0.084 -
CTRL 90%; κ = 0.783 - 100%; κ = NA -
Bone proliferations     
   MCP joint (total) 97%; κ = 0.783 93%; κ = -0.036 96%; κ = NA 97%; κ = NA
PsA 95%; κ = 0.776 88%; κ = -0.061 94%; κ = NA 95%; κ = NA
RA 100%; κ = NA 100%; κ = NA 100%; κ = NA 100%; κ = NA
CTRL 100%; κ = NA 100%; κ = NA 100%; κ = NA 100%; κ = NA
   PIP joint (total) 92%; κ = 0.665 93%; κ = 0.424 93%; κ = 0.117 94%; κ = NA
PsA 89%; κ = 0.648 88%; κ = 0.397 89%; κ = 0.120 90%; κ = NA
RA 100%; κ = NA 100%; κ = NA 98%; κ = NA 100%; κ = NA
CTRL 100%; κ = NA 100%; κ = NA 100%; κ = NA 100%; κ = NA
   DIP joint (total) 95%; κ = 0.851 95%; κ = 0.427 94%; κ = 0.472 98%; κ = 0.658
PsA 94%; κ = 0.838 92%; κ = 0.414 91%; κ = 0.476 97%; κ = 0.651
RA 100%; κ = NA 100%; κ = NA 100%; κ = NA 100%; κ = NA
CTRL 100%; κ = NA 100%; κ = NA 95%; κ = NA 100%; κ = NA
   MTP joint (total) 93%; κ = 0.515 - 99%; κ = NA -
PsA 92%; κ = 0.250 - 98%; κ = NA -
RA 100%; κ = 1.000 - 100%; κ = NA -
CTRL 100%; κ = NA - 100%; κ = NA -
  1. Values are absolute agreement presented as a percentage. The imaging modalities were ultrasonography (US), magnetic resonance imaging (MRI), and projection radiography (x-ray). The interobserver substudy was performed by ultrasonographer 1 (Charlotte Wiell = US1) and ultrasonographer 2 (Marcin Szkudlarek = US2). A hyphen (-) indicates that the measurement was not performed. κ, kappa value; CTRL, healthy control person; DIP, distal interphalangeal; MCP, metacarpophalangeal; MTP, metatarsophalangeal; NA, not applicable; PIP, proximal interphalangeal; PsA, psoriasis-associated arthritis; RA, rheumatoid arthritis.