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Table 5 Correlation between compositional cartilage measures (i.e., dGEMRIC indices) and structural cartilage measures (i.e., total cartilage thickness, TCT) as well as semi-quantitative measures of joint inflammation, osteoproliferation, and destruction. Correlations were assessed for the metacarpophalangeal (MCP), proximal interphalangeal (PIP), and distal interphalangeal (DIP) joint levels of fingers 2–5. Psoriatic arthritis magnetic resonance imaging score (PsAMRIS) and PsAMRIS sub-scores are synovitis, flexor tenosynovitis, extensor tenosynovitis periarticular inflammation, bone erosion, bone edema, and bone proliferation. p values < 0.05 were considered significant and are given in bold. τ = Kendall tau correlation coefficient

From: Proteoglycan loss in the articular cartilage is associated with severity of joint inflammation in psoriatic arthritis—a compositional magnetic resonance imaging study

dGEMRIC

Overall

MCP

PIP

DIP

τ

p

τ

p

τ

p

τ

p

TCT

0.43

< 0.001

0.51

0.015

0.04

0.826

0.41

0.051

PsAMRIS

− 0.3

0.139

− 0.5

0.012

− 0.33

0.102

− 0.43

0.029

Flexor tenosynovitis

− 0.34

0.098

− 0.24

0.243

− 0.4

0.049

− 0.32

0.109

Extensor tenosynovitis

− 0.31

< 0.001

− 0.33

0.001

− 0.31

0.002

− 0.32

0.002

Synovitis

− 0.4

0.048

− 0.56

0.006

− 0.45

0.094

− 0.32

0.109

Periarticular inflammation

− 0.61

0.003

− 0.47

0.022

− 0.72

< 0.001

− 0.37

0.072

Bone erosion

− 0.20

0.320

0.06

0.761

− 0.30

0.880

− 0.37

0.070

Bone edema

− 0.13

0.543

− 0.04

0.846

− 0.17

0.391

− 0.29

0.143

Bone proliferation

0.01

0.954

0.04

0.865

− 0.07

0.732

< 0.01

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