Composite biomaterial as a carrier for bone-Active substances for metaphyseal tibial bone defect reconstruction in rats

Research output: Contribution to journalArticle

Abstract

Restoring lost bone is a major challenge in orthopedic surgery. Currently available treatment strategies have shortcomings, such as risk of infection, nonunion, and excessive resorption. Our primary aim was to study if a commercially available gentamicin-containing composite calcium sulfate/hydroxyapatite biomaterial (GBM) could serve as a carrier for local delivery of bone morphogenic protein-2 (BMP-2) and zoledronic acid (ZA) in a tibia defect model in rats. Empty and allograft-filled defects were used as controls. A 3 × 4-mm metaphyseal bone defect was created in the proximal tibia, and the rats were grouped according to defect filling: (1) Empty, (2) Allograft, (3) GBM, (4) GBM + ZA, and (5) GBM + ZA + BMP-2. In vivo microcomputed tomography (micro-CT) images at 4 weeks showed significantly higher mineralized tissue volume (MV) in the intramedullary defect region and the neocortical/callus region in all GBM-Treated groups. After euthanization at 8 weeks, ex vivo micro-CT showed that addition of ZA (GBM + ZA) and BMP-2 (GBM + ZA + BMP-2) mainly increased the neocortical and callus formation, with the highest MV in the combined ZA and BMP-2-Treated group. Qualitative histological analysis, verifying the increased neocortical/callus thickness and finding of trabecular bone in all GBM-Treated groups, supported that the differences in MV measured with micro-CT in fact represented bone tissue. In conclusion, GBM can serve as a carrier for ZA and BMP-2 leading to increased MV in the neocortex and callus of a metaphyseal bone defect in rats.

Details

Authors
Organisations
External organisations
  • University of Copenhagen
  • Copenhagen University Hospital
  • Lund University
  • Skåne University Hospital
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Biomaterials Science

Keywords

  • Biomaterial, Bone morphogenic protein, Bone regeneration, Bone substitute, Ceramic, Collagen, Zoledronic acid
Original languageEnglish
Pages (from-to)1403-1412
Number of pages10
JournalTissue Engineering - Part A
Volume23
Issue number23-24
Publication statusPublished - 2017 Dec 1
Publication categoryResearch
Peer-reviewedYes

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