Abstract
The haemolytic activity and the effect on the plasmatic phase of coagulation of seven bone cements were evaluated (Sulfix-60 from Sulzer Orthopedic Inc., a bone cement at low viscosity from Zimmer, a bone cement dough-type from Zimmer, Palacos R from Merck, CMW1, CMW2 and CMW3 from DePuy International Ltd.). Haemolytic activity was tested by adding the cement extracts in phosphate buffered saline to a suspension of erythrocytes. After 4 h incubation at 37 degrees C, the haemoglobin concentration was determined on the supernatants by colorimetric method. The effect on the plasmatic phase of coagulation was tested by adding the cement extracts in saline to human plasma. After 30 min incubation at room temperature activated partial thromboplastin time (APTT) was determined. All extracts induced non-significant variations of haemoglobin concentration and APTT. It was concluded that the tested cement extracts do not induce haemolysis and do not activate the intrinsic pathway of coagulation, at least in the tests that were performed.
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