Demonstrates patient positioning prior to bone marrow aspirate harvesting on a left iliac crest. Care should be taken to ensure that the harvest site is prepped in a completely sterile fashion. BMAC is harvested from the posterior superior iliac crest region. When the patient is positioned prone, it is important that care is taken to ensure that all bony pressure points and areas of potential nerve compression are adequately padded. Monitored anesthesia (conscious sedation), local anesthesia, or general anesthesia can be used for this BMAC harvest procedure, we prefer positioning the patient in the prone position with light sedation monitored by an anesthesiologist for access to the posterior superior iliac crest. (BMAC, bone marrow aspirate concentrate.)