[Thromboprophylaxis is not indicated for knee arthroscopy and cast immobilisation].

The incidence ofvenous thromboembolism following knee arthroscopy and plaster-cast immobilisation of the lower extremity is considerable (10-20%). The available data are insufficient to demonstrate that pharmacological thromboprophylaxis reduces the incidence of venous thromboembolism significantly. Withholding patients thromboprophylaxis in these situations is therefore a reasonable approach.