had radiographic damage. The median of IFX treatment duration was 9 years. There were no significant differences between the GS, CD and GLOESS scores at IFX peak time and trough time. US-joint count, GS, CD and GLOESS scores did not significantly differ between peak time and trough time. Patients with longlasting RA treated with IFX had relatively stable US-detected synovitis and slightly lower clinical scores at 4 weeks after IFX administration as compared to baseline. The DAS28CRP, 28 and 44

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... wollen joint counts did not correlate with trough serum IFX concentrations. US scores (GS and GLOESS) significantly correlate with trough serum IFX concentrations (Spearman correlation coefficient, r=À0.55, p=0.01, n=20). Patients with low trough IFX levels, especially £1 mg/ml, had higher US joint count as well as US scores (p<0.01).