In a preclinical study designed to determine the effects of PDGF on exposed bone, rats injected at the metatarsals with 3 or 10 µg/ site (concentration of 30 or 100 µg/ ml/ site) of becaplermin every other day for 13 days displayed histological changes indicative of accelerated bone remodelling consisting of periosteal hyperplasia and subperiosteal bone resorption and exostosis.