In vivo study of the effect of RGD treatment on bone ongrowth on press-fit titanium alloy implants

Brian Elmengaard, Joan E. Bechtold, Kjeld Søballe

Research output: Contribution to journalArticlepeer-review

152 Scopus citations

Abstract

Early bone ongrowth is known to increase primary implant fixation and reduce the risk of early implant failure. Arg-Gly-Asp (RGD) peptide has been identified as playing a key role in osteoblast adhesion and proliferation on various surfaces. The aim for this study is to evaluate the effect of RGD peptide coating on the bony fixation of orthopaedic implants, to justify its further evaluation in clinical applications. Sixteen unloaded cylindrical plasma sprayed Ti6Al4 V implants coated with cyclic RGD peptide were inserted as press-fit in the proximal tibia of 8 mongrel dogs for 4 weeks. Uncoated control implants were inserted in the contralateral tibia. Results were evaluated by histomorphometry and mechanical push-out test. A significant two-fold increase was observed in bone ongrowth for RGD-coated implants. Also, fibrous tissue ongrowth was significantly reduced for RGD-coated implants. Bone volume was significantly increased in a 0-100 μm zone around the implant. The increased bony anchorage resulted in moderate increases in mechanical fixation as apparent shear stiffness was significantly higher for RGD-coated implants. Increases in median ultimate shear strength and energy to failure were also observed. This study demonstrates that cyclic RGD coating increases early bony fixation of unloaded press-fit titanium implants.

Original languageEnglish (US)
Pages (from-to)3521-3526
Number of pages6
JournalBiomaterials
Volume26
Issue number17
DOIs
StatePublished - Jun 2005

Bibliographical note

Funding Information:
Financial support was received from The Danish Rheumatism Association, Interdisciplinary Research Group, Nanoscience and biocompatibility; Grant no.2052-01-0049; Danish Research Agency, The Danish Medical Association Research Foundation, Helga and Peter Kornings Foundation, Midwest Orthopaedic Research Foundation, MN, USA.

Keywords

  • Implant fixation
  • In vivo
  • Integrins
  • Osteoblasts
  • RGD peptide

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