Presence of Haptoglobin in Synovial Fluid

ELECTROPHORETICALLY classified α- and β-glycoproteins have been shown to be normal constituents of synovial fluid 1 . Evidence based on immunoelectrophoresis and Cohn fractionation of human traumatic effusions also suggests the presence of most of the serum proteins in synovial fluid 2,3 . Individual biologically active serum proteins have also been found, namely, some enzymes 4 , siderophilin 3 , cærulo-plasmin 3 , and the thyroxine-binding protein 5 . The accepted blood-coagulating factors, however, were found to be absent from normal bovine fluid 6 .