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Intra-articular pressure in rheumatoid arthritis of the knee. II. Effect of intra-articular pressure on blood circulation to the synovium.

In the course of measurement of knee joint elastance, pressures in simulated effusions were continuously recorded. With the joint empty, or containing only small volumes at relatively low pressures, straightline tracings were obtained, indicating that the intra-articular pressure was constant. However, in some subjects, at increasing volumes of simulated effusion, a fine pulsation appeared. As further fluid was added, the pulsation increased at first, then diminished, and was finally obliterated. The pulsations were always synchronous with the arterial pulse. Subjects studied