“…It has been shown that the incidence of infection fol lowing this procedure can be significantly reduced by the administration of antibiot ics to cover the operative period [5,6,10,11,14,17]. The main organisms that cause postoperative infection are Staphylococcus aureus, Staphylococcus albus and various gram-negative bacilli [10,12], The anti biotic that is used for prophylaxis must thus be active against all strains of S. au reus as well as against other possible in fecting organisms.…”