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Achieving interconnected pore architecture in injectable PolyHIPEs for bone tissue engineering.

Jennifer L Robinson1, Robert S Moglia, Melissa C Stuebben

  • 1Department of Biomedical Engineering, Texas A&M University , College Station, Texas.

Tissue Engineering. Part A
|October 16, 2013
PubMed
Summary
This summary is machine-generated.

Injectable biodegradable scaffolds made from high internal phase emulsion (polyHIPE) polymers were developed with interconnected pores for enhanced bone healing. These materials demonstrate tunable mechanical properties and potential for bone defect regeneration.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • High internal phase emulsion (polyHIPE) scaffolds offer tunable porosity for tissue regeneration.
  • Previous polyHIPEs had closed pores, limiting bone ingrowth.
  • Biodegradable injectable polyHIPEs are needed to fill bone defects and enhance healing.

Purpose of the Study:

  • Develop injectable, biodegradable polyHIPEs with interconnected porosity for bone tissue engineering.
  • Overcome limitations of closed-pore scaffolds for improved bone ingrowth.
  • Evaluate the potential of these scaffolds for bone defect repair.

Main Methods:

  • Fabricated high internal phase emulsions (HIPEs) using organic-phase initiation.
  • Investigated the effect of initiator location on pore morphology and scaffold properties.
  • Characterized mechanical properties (compressive modulus, strength), viscosity, and pore architecture.
  • Assessed injectability, defect filling, and integration with bone tissue.

Main Results:

  • Organic-phase initiation created interconnected pores in polyHIPEs.
  • Mechanical properties (43±12 MPa modulus, 3±0.2 MPa strength) approach those of cancellous bone.
  • Injectable viscosity (11.0±2.3 Pa·s) allowed defect filling and retention.
  • Pre-curing tuned work/set times; 1-week cold storage did not affect pore architecture.

Conclusions:

  • Interconnected polyHIPEs are promising injectable scaffolds for bone tissue engineering.
  • The developed scaffolds facilitate bone ingrowth and defect healing.
  • Tunable properties and storage stability support clinical translation for bone regeneration.