“…Several studies investigating practice regarding orthopedic thromboprophylaxis have been published from the United States (Mesko et al 2001), Canada (Gross et al 1999), the UK (Francis and Brenkel 1997), Sweden (Bergqvist 1985), and Australia and New Zealand (Rodgers et al 1994). A wide variation in regimens is common in all these studies; unfortunately, it is not known how this reflects on the incidence of VTE.…”