The use of homologous blood transfusion should be minimized to reduce the risks of transfusion including transfer of HBV and HIV. This aim can be achieved by hypotensive anesthesia or autolog blood transfusion either by predeposited blood or intraoperative autotransfusion. This study evaluates the results of intraoperative auto-transfusion in 134 patients who are operated betvveen June 1991 and April 1994. Twenty one of operations were revision surgery of total hip replacement while 12 of them were primary cementiess total hip replacement, 20 were posterior vertebral instrumentation for vertebral fractures, 15 were anterior discectomies for treatment of scoliosis, 4 were one-stage anterior discectomy and posterior instrumentation, 62 were correction and posterior instrumentation for scoliosis. The average amount of blood saved during surgery was 768.6+52.8 cc. and the amount of blood used for homolog transfusion was 1.5+0.82 units. At the same time period 62 patients were operated for primary total hip arthropiasty and 18 patients had spinal instrumentation without having autotransfusion. 2.94±0.73 units of homolog blood was used. The results show that the difterence between the preoperative and postoperative values of haematocrite are significant. The need for homolog transfusion was 45% less in the auto- transfusion group.