We found a good level of agreement and no significant systematic joint size-related differences in cartilage thickness measurements between MRI and US. US appears to be a feasible method for evaluating cartilage thickness in JIA target joints, especially when age and sex-related references are defined.
Background: Loss of joint cartilage is a feature of destructive disease in JIA. The cartilage of most joints can be visualized with ultrasonography (US). Our present study focuses on discriminant validity of US in children. We studied reproducibility between and within a skilled and a non-skilled investigator of US assessment of cartilage thickness in small and large joints in healthy children.
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