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Vet Comp Orthop Traumatol 2014; 27(06): 411-421
DOI: 10.3415/VCOT-14-03-0036
Original Research
Schattauer GmbH

BMP-2 delivered from a self-cross-linkable CaP/hydrogel construct promotes bone regeneration in a critical-size segmental defect model of non-union in dogs

K. Minier
1   Department of Small Animal Surgery, Oniris College of Veterinary Medicine, Nantes, France
3   Centre Hospitalier Veterinaire Fregis, Arcueil, France
,
A. Touré
2   University of Nantes, INSERM, UMR 791, LIOAD, Nantes, France
,
M. Fusellier
1   Department of Small Animal Surgery, Oniris College of Veterinary Medicine, Nantes, France
2   University of Nantes, INSERM, UMR 791, LIOAD, Nantes, France
,
B. Fellah
1   Department of Small Animal Surgery, Oniris College of Veterinary Medicine, Nantes, France
,
B. Bouvy
3   Centre Hospitalier Veterinaire Fregis, Arcueil, France
,
P. Weiss
2   University of Nantes, INSERM, UMR 791, LIOAD, Nantes, France
,
O. Gauthier
1   Department of Small Animal Surgery, Oniris College of Veterinary Medicine, Nantes, France
2   University of Nantes, INSERM, UMR 791, LIOAD, Nantes, France
› Author Affiliations
Further Information

Publication History

Received: 04 March 2014

Accepted: 31 July 2014

Publication Date:
23 December 2017 (online)

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Summary

Objectives: To determine whether the addition of recombinant human bone morphogenetic protein (rhBMP-2) to a self-crosslinkable cellulosic hydrogel/biphasic calcium phosphate (BCP) granules construct promotes bone healing in critical-size ulnar defects in dogs.

Methods: A standardized 2 cm long ulnar ostectomy was performed bilaterally in five dogs to compare bone healing with hydrogel/BCP constructs associated with or without rhBMP-2. Cancellous-bone autografts were used as positive controls in unilateral ulnar defects in five additional dogs. Radiographically, bone healing was evaluated at four, eight, 12, 16 and 20 weeks postoperatively. Histological qualitative analysis with microCT imaging and light and scanning electron microscopy were performed 20 weeks after implantation.

Results: All rhBMP-2-loaded constructs induced the formation of well-differentiated mineralized lamellar bone surrounding the BCP granules and bridging bone/implant interfaces as early as eight weeks after surgery. Bone regeneration appeared to develop earlier with the rhBMP-2 constructs than with the cancellous-bone autografts while similar results were obtained at 20 weeks. Constructs without any rhBMP-2 showed osteoconductive properties limited to the bone junctions and a lack of osteoinduction without bone ingrowth within the implantation site. In one dog, the leakage of the hydrogel loaded with rhBMP-2 induced an extensive heterotopic bone formation.

Clinical significance: The addition of rhBMP-2 to a self-crosslinkable hydrogel/BCP construct could promote bone regeneration in a critical-size-defect model with similar performance to autologous bone grafts.

Keywords

Recombinant human bone morphogenetic protein - BMP-2 - calcium phosphate hydrogel - bone union - critical sized defect - dog
 

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