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Joint space narrowing (JSN) is a measureable outcome of the tissue degeneration caused by the inflammatory process of the synovium in arthritis. JSN is usually assessed by conventional radiography. Ultrasonographic measurements of joint cartilage thickness in large and small joints have been validated in a study of healthy children and recently, measurements of distal femoral cartilage of the knee joint have been validated in a group of JIA patients.

pediatric rheumatology online journal

PReS-FINAL-2344: Radiographic evaluation of joint space width compared to cartilage thickness as assessed by ultrasonography in knees of children with juvenile idiopathic arthritis