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In vivo performance of bilayer hydroxyapatite scaffolds for bone tissue regeneration in the rabbit radius

Journal of Materials Science: Materials in Medicine volume 22, pages 647–656 (2011)Cite this article

Abstract

The objective of this study was to investigate the in vivo biomechanical performance of bone defects implanted with novel bilayer hydroxyapatite (HAp) scaffolds that mimic the cortical and cancellous organization of bone. The scaffolds maintained architectural continuity in a rabbit radius segmental defect model and were compared to an untreated defect group (negative control) and autologous bone grafts (positive control). Micro-CT evaluations indicated total bone and scaffold volume in the experimental group was significantly greater than the defect group but lesser than the autologous bone graft treatment. The flexural toughness of the scaffold and the autograft groups was significantly greater than the flexural toughness of the defect group. Interestingly, the absolute density of the bone mineral as well as calcium to phosphorus (Ca/P) ratio in that mineral for the scaffold and autograft contralateral bones was significantly higher than those for the defect contralaterals suggesting that the scaffolds contributed to calcium homeostasis. It was concluded from this study that new bone regenerated in the bilayer HAp scaffolds was comparable to the empty defects and while the HAp scaffolds provided significant increase in modulus when compared to empty defect and their flexural toughness was comparable to autografts after 8 weeks of implantation.

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Acknowledgments

This study was supported in part by the Department of Defense funds and the Orthopaedic Extremity Trauma Research Program grants (USAMRMC # W81XWH-08-1-0393 and W81XWH-07-1-0717). The opinions or assertions contained herein are the private views of the author and are not to be construed as official or as reflecting the views of the Department of the Army or the Department of Defense.

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Authors and Affiliations

  1. Extremity Trauma and Regenerative Medicine Task Area, United States Army Institute of Surgical Research, 3400 Rawley E. Chambers Ave., Fort Sam Houston, TX, 78234, USA

    Teja Guda, John A. Walker & Joseph C. Wenke

  2. Department of Biomedical Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA

    Teja Guda, Beth E. Pollot, Mark R. Appleford, Sunho Oh & Joo L. Ong

  3. Wake Forest Institute of Regenerative Medicine, Wake Forest University Health Sciences, Richard H. Dean Biomedical Building, 391 Technology Way, Winston-Salem, NC, 27157, USA

    Teja Guda

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  1. Teja Guda
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  2. John A. Walker
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  3. Beth E. Pollot
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  4. Mark R. Appleford
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  7. Joseph C. Wenke
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Correspondence to Teja Guda.

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Guda, T., Walker, J.A., Pollot, B.E. et al. In vivo performance of bilayer hydroxyapatite scaffolds for bone tissue regeneration in the rabbit radius. J Mater Sci: Mater Med 22, 647–656 (2011). https://doi.org/10.1007/s10856-011-4241-7

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  • DOI: https://doi.org/10.1007/s10856-011-4241-7

Keywords

  • Bone Ingrowth
  • Flexural Modulus
  • Contralateral Limb
  • Defect Group
  • Autologous Bone Graft