Predicting outcome at the knee in juvenile rheumatoid arthritis.

: This study was undertaken to correlate long-term severe radiographic changes with clinical profiles in an attempt to identify a group of patients at risk. Knee radiographs of 100 juvenile rheumatoid arthritis (JRA) patients with 1-20 years of follow-up studies were reviewed for changes leading to severe disability. Eighteen children had evidence of destructive changes an average of 4.3 years after onset of JRA. 23 patients had reactive changes superimposed on destructive changes seen 9.7 years after onset of disease. 92% of the children with reactive and destructive knee changes had radiographic evidence of significant JRA at another joint. Polyarticular disease with significant JRA involvement of another joint seems to indicate a group of children at higher risk for destructive and reactive changes at the knee.