OBJECTIVE To study the effect of different anesthesia methods on respiratory infections in elderly patients undergoing hip replacement surgery.METHODS Totally 54 cases of elderly patients undergoing hip replacement surgery in our hospital from Jan.2014 to Jan.2015 were selected and grouped by random table method.The26 patients who underwent tracheal intubation for anesthesia were set as the intubated anesthesia group and the 28 patients who underwent spinal anesthesia were set as the spinal anesthesia group...