title: Repair of ulnar segmental defect by recombinant human bone morphogenetic protein-2 in dogs.
abstract: The efficacy of recombinant human bone morphogenetic protein-2 (rhBMP-2) combined with poly D, L lactic-co-glycolic acid (PLGA)/gelatin sponge complex (PGS) as a carrier on the repair of segmental long-bone defects was evaluated using an ulnar model in dogs. The defect was 2 cm in length and was fixed with bone plating. After implantation of PGS with or without rhBMP-2, the repair process of the defect was evaluated by serial radiography until 16 postoperative weeks. All defects treated with 160 micrograms or 640 micrograms of rhBMP-2/PGS revealed bone union radiographically by 12 postoperative weeks, whereas all defects treated with PGS alone revealed no radiographic evidence of healing throughout the experimental period. In defects treated with 40 micrograms of rhBMP-2/PGS, new bone appeared partially at the defects but did not accomplish union. Bone mineral contents at the defect sites after harvest at 16 weeks postoperatively were significantly (p < 0.05) higher in those treated with 160 micrograms or 640 micrograms of rhBMP-2 than in those treated with 40 micrograms of rhBMP-2 or PGS alone. Histologically, defects radiographically diagnosed as having achieved union showed the appearance of cortical bone and bone marrow cells. These findings suggest the use of rhBMP-2/PGS as a potential bone graft substitute in reconstructive surgery in dogs.
authors.affiliation: Laboratory of Veterinary Surgery, Graduate School of Agriculture and Life Science, University of Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Itoh
authors.forename: M
authors.initials: M
authors.lastname: Mochizuki
authors.forename: R
authors.initials: R
authors.lastname: Nishimura
authors.forename: S
authors.initials: S
authors.lastname: Matsunaga
authors.forename: T
authors.initials: T
authors.lastname: Kadosawa
authors.forename: S
authors.initials: S
authors.lastname: Kokubo
authors.forename: S
authors.initials: S
authors.lastname: Yokota
authors.forename: N
authors.initials: N
authors.lastname: Sasaki
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D015519:Bone Density; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D018786:Bone Substitutes; D004283:Dog Diseases; D004285:Dogs; D005260:Female; D005780:Gelatin; D006801:Humans; D019344:Lactic Acid; D008297:Male; D019637:Orthopedic Procedures / Q000379:methods / Q000662:veterinary; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D011859:Radiography; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; D014458:Ulna Fractures / Q000000981:diagnostic imaging / Q000601:surgery / Q000662:veterinary*; D014945:Wound Healing
chemical_list: C525718:BMP2 protein, human; D001672:Biocompatible Materials; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D018786:Bone Substitutes; D011108:Polymers; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; C499469:recombinant human bone morphogenetic protein-2; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D005780:Gelatin