Pressure measurements in the knee joint and gastrocnemio-semimembranosus bursa were performed on patients and autopsy cases. A normally occurring closure mechanism between the joint and the bursa was demonstrated and analysed. Two patients were also found to have a partial valvular mechanism in the form of a hindrance to spontaneous passage of fluid from the bursa to the joint but no hindrance in the other direction.
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P. G. Lindgren (1978) studied this question.
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