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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 1