Saint Joseph Mercy Hospital View Institution's Website 1 article published in JoVE Medicine Repair of a Critical-sized Calvarial Defect Model Using Adipose-derived Stromal Cells Harvested from Lipoaspirate David D. Lo*1,2, Jeong S. Hyun*1,3, Michael T. Chung1, Daniel T. Montoro1, Andrew Zimmermann1, Monica M. Grova1,4, Min Lee5, Derrick C. Wan1, Michael T. Longaker1 1Department of Surgery, Stanford University, 2Department of Surgery, Duke University, 3Department of Surgery, Saint Joseph Mercy Hospital, 4School of Medicine, University of California, San Francisco, 5School of Dentistry, University of California, Los Angeles This protocol describes the isolation of adipose-derived stromal cells from lipoaspirate and the creation of a 4 mm critical-sized calvarial defect to evaluate skeletal regeneration.