Stem Cells After Peripheral Mobilization and Harvest

The proposed study is a controlled laboratory study where stem cell content of bone marrow aspirate will be compared prior to and following pharmaceutical mobilization. Participants who meet the inclusion/exclusion criteria will have a bone marrow sample taken from the iliac crest. The sample will be tested to determine stem cell content and for the presence of proteins which are of interest in orthopedic treatments. Thirty days following the baseline bone marrow collection, participants will receive a subcutaneous injection of Filgrastim daily for four serial days. On the fifth day, a peripheral blood sample will be taken and processed.