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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.