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The significance and importance of investigation of the synovial fluid enzymes in the main arthropathies are explanined. Tables are given for the main enzymes studied, the cell compartments of origin, and data for their values in rheumatic diseases (as reported in the literature). Stress is laid on the importance of enzymes belonging to the lysosomial compartment, both in the pathogenesis of the underlying inflammation and in the relation to anatomopathological lesions in the joints. Attention is directed to the most widely accepted hypotheses. These ten to see enzymes increases in breakdown of condrocytes, as inflammatory arthritis attributable to synoviocytes and leukocytes. A personal opinion based on prior research is also presented. Further work in this sector is urged a mean of learning more about the pathology of rheumatic diseases.