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MRI results were used as a reference standard for joint status. Pearson's r was used to assess correlation of other methods with MRI. The correlation with MRI was the highest for US (r=.92), considerably higher than for clinical evaluation (r=.62) and patient's subjective assessment (r=.66). There was no correlation between the presence or degree of haemophilic arthropathy and any of the laboratory biomarkers. The results of our study warrant the inclusion of US into the regular follow-up of patients with severe haemophilia, where the