Study Performance of The Plexur P™ Bone Void Filler Device in Patients Undergoing Iliac Crest Harvesting Procedures

The purpose of this study is to determine if Plexur P grows bone in the iliac crest (where bone was removed or "harvested") for the back surgery. The study will be focusing on patients who require back surgery. Often additional bone is required from the hip of the patient (iliac crest). When bone removed from the hip, a "void" is often created. This "void" will be filled in with Osteotech's Plexur P product.