First, your bone marrow is aspirated or drawn out of the back part of the pelvis. This is really not as bad as it might sound. You will lay face down on a comfortable body pillow, and the skin over your lower back and hips will be thoroughly cleaned with a surgical skin preparation called Chloroprep and draped. We then numb the skin and the surface of the bone at the aspiration site. After the skin is numb, we use a special needle designed to go through bone to enter the bone marrow cavity in the hip bones near your lower back, near your buttocks. Then we aspirate the bone marrow into a syringe with a small amount of anti-coagulant (heparin) in it to keep the bone marrow from clotting during this process. Let me know if you have an allergy to heparin. This process is repeated at least at three sites on the bone, but up to six sites depending on the amount of BMAC needed to do the case. A bandage will be placed on the aspiration site. Then the bone marrow is filtered to get rid of very tiny bone fragments and is transferred in sterile fashion into a special centrifuge tube. It is then centrifuged for two cycles to isolate the MSCs to make the final BMAC ready for injection.