Cites the report of researchers at Ann Arbor, Michigan-based University of Michigan Medical School about the technique for localized delivery of gene products that accelerates healing of a bone fracture. Reference to 1999 issue of the journal 'Nature Medicine,' vol. 5, 753-759; Use of system in which plasmid DNA encoding human parathyroid hormone is trapped within a polymer gene-activated matrix carrier; Deployment of plasmid-gene.