The company said that the Lutheran Medical Center in Brooklyn, N.Y., will participate in the early- to mid-stage study on the use of Aastrom's adult stem cell-based tissue-repair cell treatment for severe long bone nonunion fractures.

The Phase I/II study is also being conducted at Lutheran General Hospital in Park Ridge, Ill., the University of Michigan Health System in Ann Arbor, and the William Beaumont Hospital in Royal Oak, Mich.