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On the basis of the results of the 11 studies reviewed, thromboprophylaxis with unfractionated heparin, low molecular weight (LMW) heparin or a heparinoid (danaparoid sodium; Org 10172) in patients undergoing total hip replacement did not show any important clinical differences with respect to the tolerability profiles of the different compounds. However, as a result of the great variability in the presentation and evaluation of blood losses and bleeding complications in these studies, it is mandatory to perform a direct comparison of the different compounds in question in a double-blind, prospective clinical study.