[Isoelectric focusing studies of synovial fluid in rheumatoid arthritis].

Synovial fluids obtained at operation in several different diseases were studied by means of isoelectrical focussing. All the punctates of patients with rheumatoid arthritis showed bands which migrated towards the cathode and which were not found in synovial fluid from other diseases, except in 2 meniscus lesions. In the range of pH 6.81-7.30, typical synovial proteins were demonostrated.