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Table 4 Agreements between US, MRI, and clinical examination for inflammatory 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

USa versus clinical examinationb

MRIc versus clinical examinationb

Synovitis

    

   MCP joint (total)

88%; κ = 0.305

83%; κ = 0.574

62%; κ = -0.033

63%; κ = 0.047

PsA

84%; κ = 0.280

80%; κ = 0.540

62%; κ = 0.047

64%; κ = 0.131

RA

100%; κ = NA

75%; κ = 0.519

63%; κ = -0.007

60%; κ = 0.091

CTRL

100%; κ = NA

100%; κ = NA

63%; κ = NA

100%; κ = NA

   PIP joint (total)

78%; κ = 0.361

78%; κ = 0.337

66%; κ = NA

66%; κ = 0.012

PsA

84%; κ = 0.367

73%; κ = 0.290

64%; κ = -0.053

68%; κ = 0.149

RA

50%; κ = 0.059

75%; κ = 0.375

63%; κ = 0.162

50%; κ = -0.190

CTRL

100%; κ = NA

95%; κ = NA

73%; κ = NA

95%; κ = NA

   DIP joint (total)

83%; κ = 0.129

87%; κ = 0.177

74%; κ = -0.020

79%; κ = -0.082

PsA

84%; κ = 0.120

78%; κ = 0.039

72%; κ = 0.041

68%; κ = -0.098

RA

100%; κ = NA

100%; κ = 1.000

83%; κ = -0.077

90%; κ = -0.053

CTRL

100%; κ = NA

100%; κ = NA

73%; κ = NA

100%; κ = NA

   MTP joint (total)

91%; κ = 0.825

-

51%; κ = -0.063

-

PsA

90%; κ = 0.799

-

55%; κ = -0.038

-

RA

100%; κ = 1.000

-

52%; κ = -0.034

-

CTRL

90%; κ = 0.783

-

38%; κ = NA

-

Tenosynovitis

    

   MCP joint (total)

93%; κ = -0.034

91%; κ = 0.484

-

-

PsA

91%; κ = -0.048

90%; κ = 0.227

-

-

RA

100%; κ = NA

85%; κ = 0.625

-

-

CTRL

100%; κ = NA

100%; κ = NA

-

-

   PIP joint (total)

87%; κ = -0.029

96%; κ = 0.645

-

-

PsA

89%; κ = -0.035

87%; κ = 0.380

-

-

RA

63%; κ = NA

75%; κ = 0.468

-

-

CTRL

100%; κ = NA

100%; κ = NA

-

-

   DIP joint (total)

97%; κ = NA

96%; κ = 0.645

-

-

PsA

98%; κ = NA

98%; κ = 0.659

-

-

RA

88%; κ = NA

85%; κ = 0.571

-

-

CTRL

100%; κ = NA

100%; κ = NA

-

-

Insertional changes

    

   Extensor tendons (total)

88%; κ = NA

94%; κ = 0.370

-

-

PsA

83%; κ = NA

92%; κ = 0.400

-

-

RA

100%; κ = NA

95%; κ = NA

-

-

CTRL

100%; κ = NA

100%; κ = NA

-

-

   Flexor tendons (total)

98%; κ = NA

95%; κ = 0.593

-

-

PsA

98%; κ = NA

97%; κ = NA

-

-

RA

100%; κ = NA

85%; κ = 0.634

-

-

CTRL

100%; κ = NA

100%; κ = NA

-

-

Capsular/extra-capsular changes

    

   Total

86%; κ = NA

87%; κ = 0.511

-

-

PsA

83%; κ = NA

88%; κ = 0.410

-

-

RA

88%; κ = NA

90%; κ = 0.692

-

-

CTRL

100%; κ = NA

100%; κ = NA

-

-

  1. aUltrasonography (US) synovitis (synovial hypertrophy and/or effusion, and/or power Doppler signal); bclinically tender and swollen joints; cmagnetic resonance imaging (MRI) synovitis. Values are absolute agreement presented as a percentage. The imaging modalities were US, MRI, and clinical examination. 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.