Objective To evaluate the protective effect of estrogen on spinal cord ischemia-reperfusion injury inrabbits and its mechanism.Methods According to a random number table method,adult New Zealand rabbits weredivided into A-E five groups with9in each group.In the rabbits of group A,infrarenal aorta was clamped for20min and then blood circulation was restored(reperfusion).The rabbits of group B received the same anesthesia andsurgery as group A,but no ischemia-reperfusion injury.The rabbits of groups C,D and E had injection of estrogen200,400and80...