The spectro-fluorescent characteristics of synovial exudate in different diseases of the knee joint were studied. It was established that in pigmented villonodular synovitis the position of the maximum of fluorescence spectrum of synovial exudate was in the range of 510-530 nm and in synovitis of other etiology 430-440 nm. The authors propose a method of differential diagnosis of pigmented villonodular synovitis by fluorescent parameters of synovial exudate.
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