 Despite the recommendation in several guidelines of preoperative bathing with 4 chlorhexidine gluconate as a measure for the prevention of SSI, there is no evidence in the literature that support this practice. The objective of this study is to evaluate the effect of nursing intervention: preoperative bath using 4 chlorhexidine gluconate solutions, 10 povidone iodine degermante or soap without antiseptic for the prevention of SSI in patients undergoing elective hip arthroplasty surgery. The specific objectives are to compare the incidence of SSI in the three interventions, to assess the most effective intervention for the prevention of surgical infection and to estimate the frequency of allergic reactions caused by the use of the solutions. Two intervention groups 4 Chlorhexidine gluconate and PVPI10 and a control group without antiseptic soap composed of 52 patients undergoing hip arthroplasty in each group will be randomized to perform the baths in the period from may 2015 to june 2017. Before the intervention, nasal swabs will be collected of patients to investigate colonization by Staphylococcus aureus. 