[Spectrophotometric study of synovial exudate in differential diagnosis of pigmented villonodular synovitis].

The authors have studied the spectrophotometric characteristics of the synovial exudates in the patients with diseases of the knee joint of various etiology. The presence of two main maximums of the absorption spectra has been revealed in the wave frequencies of 280 and 460-465 nm. It has been determined that with regard to the optical densitys in the protein component (280 nm) and the pigments (460 nm) absorption area it is possible to differentiate very precisely pigmented villondular synovitis and other pathologies.