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Related Experiment Videos

Tissue engineered microsphere-based matrices for bone repair: design and evaluation.

Mark Borden1, Mohamed Attawia, Yusuf Khan

  • 1Center for Advanced Biomaterials and Tissue Engineering, Department of Chemical Engineering, Drexel University, Philadelphia, PA 19104, USA.

Biomaterials
|January 5, 2002
PubMed
Summary

Polymer microsphere matrices offer promising synthetic bone graft alternatives. Sintered microsphere matrices show versatile properties and interconnectivity suitable for bone repair applications.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Conventional bone grafts have limitations, necessitating the development of synthetic alternatives.
  • Microsphere technology offers a novel approach to designing polymer-based bone graft substitutes.
  • Poly(lactide-co-glycolide) microspheres are utilized to create porous, three-dimensional structures.

Purpose of the Study:

  • To design and evaluate polymer-based graft substitutes using microsphere technology.
  • To analyze the effects of matrix composition and processing on structural and biomechanical properties.
  • To compare gel microsphere and sintered microsphere matrices for bone repair potential.

Main Methods:

  • Fabrication of gel and sintered microsphere matrices using poly(lactide-co-glycolide) microspheres.

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  • Structural evaluation via scanning electron microscopy (SEM) and porosimetry.
  • Biomechanical assessment using compression testing.

    • Main Results:

    • Gel microsphere matrix exhibited a high Young's modulus (1651 MPa) but suboptimal pore structure for bone ingrowth.
    • Sintered microsphere matrices demonstrated interconnectivity and mechanical properties (241-349 MPa) comparable to cancellous bone.
    • Matrix pore diameter correlated with microsphere diameter; pore volume was independent of microsphere diameter.

    Conclusions:

    • Sintered microsphere matrices show significant promise as versatile polymeric substitutes for bone repair.
    • The interconnected pore system and mechanical properties of sintered matrices are advantageous for bone regeneration.
    • Microsphere diameter influences pore size, offering a parameter for tuning matrix properties.