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Intermountain Healthcare answeredLumbar spinal fusion surgery is a surgery to join two or more spinal bones -- vertebrae -- so that they eventually grow into one solid bone. Most spinal fusion patients do not need blood transfusions. Your doctor will work hard to minimize blood loss. Your doctor may also use auto-transfusion technology (cell-saver), which can return most of the blood lost back to you. This makes it even less likely that you might need a standard blood transfusion. Despite these efforts, patients do occasionally lose enough blood to need a transfusion.