Abstract
The activity of plasminogen activators and plasmin inhibitors in articular capsules of the hip and knee joints in rheumatoid arthritis, chronic traumatic inflammation, arthrosis and aseptic loosening of prosthesis was determined histochemically and correlated with the degree of mobility in osteoarthrosis of the hip. Microscopically unchanged articular capsules were employed as reference sites. In inflammatory articular diseases the plasminogen activator activity was significantly reduced, whereas it remained unchanged in arthrosis and necrosis of the heas of the femur, and significantly enhanced in aseptic loosening of prosthesis. Plasmin inhibitor activity was established in joint capsules with inflammatory changes only; in case of rheumatic inflammation, it was higher than with traumatic inflammation. In osteoarthrosis of the hip there is a positive correlation between joint mobility and plasminogen activator activity. The results point towards involvement of the local fibrinolytic system in joint diseases; however, no definite statement can be made with regard to possible causative linkups.
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