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Principles of tissue engineering applied to programmable osteogenesis

J H Brekke1, J M Toth

  • 1THM Biomedical, Inc., Duluth, Minnesota 55802, USA. jhbdlh@cpinternet.com

Journal of Biomedical Materials Research
|December 17, 1998
PubMed
Summary
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This study details a novel bioresorbable bone graft substitute (BGS) using polylactic acid, hyaluronic acid, and bone morphogenetic protein 2. In vivo testing demonstrated its efficacy in bone regeneration, offering a promising alternative for skeletal repair.

Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Bone defects require effective graft substitutes for healing.
  • Existing bone graft substitutes have limitations in osteoinduction and structural integrity.
  • Advances in biomaterials and growth factors offer new possibilities for bone regeneration.

Purpose of the Study:

  • To present a strategy for designing, engineering, and fabricating a bioresorbable bone graft substitute (BGS).
  • To integrate osteogenesis principles, hyaluronic acid biology, and osteoinductive proteins into a composite device.
  • To evaluate the in vivo performance of the developed BGS in relevant animal models.

Main Methods:

  • Design and fabrication of a composite BGS using D,D-L,L-polylactic acid macrostructure and a hyaluronan/recombinant human bone morphogenetic protein 2 (rhBMP-2) microstructure.

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  • Optimization of the macrostructure to mimic cancellous bone architecture.
  • In vivo testing in a canine intertransverse process spinal fusion model and a rabbit radial critical-sized defect model.

    • Main Results:

    • The composite BGS demonstrated successful bone regeneration in both the spinal fusion and radial defect models.
    • The D,D-L,L-polylactic acid macrostructure provided appropriate scaffolding, while the hyaluronan/rhBMP-2 microstructure promoted osteoinduction.
    • Data validated the design and engineering principles applied to the BGS.

    Conclusions:

    • The developed bioresorbable bone graft substitute is a viable option for promoting bone healing.
    • The combination of a tailored scaffold and osteoinductive factors is effective for bone regeneration.
    • This strategy offers a promising approach for manufacturing advanced bone graft substitutes.