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Juveniles with the adult pattern of disease had the greatest incidence of complement abnormalities. Evaluation of individual components by both activity determination and protein measurement showed decreased synovial fluid specific functional activity (activity per microgram protein) to be more marked in synovial fluids with profound depressions of complement activity. These findings provide further evidence that nonfunctional, antigenically intact component protein may remain after complement activation. Radial immunodiffusion measurements of properdin factors and kininogen failed to support their involvement in joint inflammation. Serum complement component measurements by activity but not protein concentration correlated with other parameters of inflammation. Four patients had isolated depressions of serum C2 activity. Immunoglobulin levels, particularly IgA, correlated with some complement measurements and with the sedimentation rate.<\/jats:p>","DOI":"10.1002\/art.1780190206","type":"journal-article","created":{"date-parts":[[2007,2,14]],"date-time":"2007-02-14T17:46:04Z","timestamp":1171475164000},"page":"161-168","source":"Crossref","is-referenced-by-count":14,"title":["Intraarticular activation of the complement system in patients with juvenile rheumatoid arthritis"],"prefix":"10.1002","volume":"19","author":[{"given":"Richard I.","family":"Rynes","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shaun","family":"Ruddy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jocelyn","family":"Spragg","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.","family":"Sydney Stillman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K.","family":"Frank Austen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,12,15]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1172\/JCI105013"},{"key":"e_1_2_1_3_2","first-page":"7","article-title":"Studies on synovial fluid in arthritis. 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