Illiac Crest Bone Marrow Aspirate Concentrate (BMAC) – BMAC involves placing a needle into the pelvic bone (iliac crest) to aspirate or collect bone marrow cells. The cells are then concentrated by being centrifuged or spun down. Unlike PRP, this procedure requires anesthesia and is usually performed in conjunction with the surgical procedure. The cells can enhance healing in procedures such as tendon repairs, cartilage surgery or fusions. The benefit of BMAC verses PRP is that the quality and amount of the stem cells is greater with BMAC than PRP.