title: Effects of FGF-2 on metaphyseal fracture repair in rabbit tibiae.
abstract: Fibroblast growth factor-2 (FGF-2) has been found to have stimulatory effects on fracture repair at diaphysis, while its effect on metaphyseal fracture repair, where spongiosal bone is dominant, has not been studied. This study was conducted to investigate the effect of FGF-2 on metaphyseal fracture healing in a rabbit proximal tibial metaphyseal model. The proximal tibial metaphysis of 6-month-old Japanese white rabbits was osteotomized bilaterally. Then 400 microg of FGF-2, mixed with gelatin hydrogel, and gelatin hydrogel alone (the control) were injected to each osteotomy site of the rabbit proximal tibiae, and the osteotomies were fixed with staples. One and 2 weeks after surgery, the osteoid area in the repairing spongiosal bone at the fracture site was significantly larger in the FGF-2 group than in the control group ( P < 0.05). On immunohistochemistry, proliferating-cell nuclear antigen-positive cells had a tendency to show greater numbers in the FGF-2 group. After 4 and 8 weeks, values for bone mineral density and the cancellous bone area in the healing region of the fracture site were significantly larger in the FGF-2 group ( P < 0.05). These data suggest that local application of FGF-2 may have an accelerating effect on the repair of metaphyseal fractures. Exogenous recombinant human rhFGF-2 may have potential clinical applications in metaphyseal fracture treatment.
authors.affiliation: Department of Orthopaedic Surgery, Graduate Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan.
authors.forename: Wei-Jia
authors.initials: WJ
authors.lastname: Chen
authors.forename: Seiya
authors.initials: S
authors.lastname: Jingushi
authors.forename: Ikuo
authors.initials: I
authors.lastname: Aoyama
authors.forename: Jun
authors.initials: J
authors.lastname: Anzai
authors.forename: Goh
authors.initials: G
authors.lastname: Hirata
authors.forename: Makoto
authors.initials: M
authors.lastname: Tamura
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
mesh_terms: D000818:Animals; D015519:Bone Density / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology*; D017102:Fracture Healing / Q000187:drug effects*; D006801:Humans; D007150:Immunohistochemistry; D010027:Osteotomy; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D011817:Rabbits; D011859:Radiography; D013978:Tibial Fractures / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000503:physiopathology*
chemical_list: D018809:Proliferating Cell Nuclear Antigen; D016222:Fibroblast Growth Factor 2