Coagulation-related complications are a frequent cause of death follow
ing hip replacement surgery. Venographically-proven deep vein thrombos
is (DVT) is found in a high frequency. Most cases have no symptoms. Fa
tal pulmonary embolism (PE) may develop from subclinical thrombi. In a
ddition, arterial thromboses may induce serious cardiovascular events
and an unknown number of patients may develop cardiorespiratory insuff
iciency, due to non-fatal venous PE, Finally, several patients may dev
elop venous insufficiency. Recent prospective double-blind studies hav
e shown that the frequency of deep vein thrombosis increased after hos
pital discharge in patients undergoing hip replacement surgery. Prolon
ged thromboprophylaxis with low-molecular-weight heparin (dalteparin o
r enoxaparin) is recommended for at least 5 weeks after the operation.