Predicting the stress distribution within scaffolds with ordered architecture

Ngoc H. Pham, Roman S. Voronov, Samuel B. Vangordon, Vassilios I. Sikavitsas, Dimitrios V. Papavassiliou

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Current tissue engineering technologies involve the seeding of cells on porous scaffolds, within which the cells can proliferate and differentiate, when cultured in bioreactors. The flow of culture media through the scaffolds generates stresses that are important for both cell differentiation and cell growth. A recent study [Appl. Phys. Lett. 97 (2010), 024101] showed that flow-induced stresses inside highly porous and randomly structured scaffolds follow a three-point gamma probability density function (p.d.f.). The goal of the present study is to further investigate whether the same p.d.f. can also describe the distribution of stresses in structured porous scaffolds, what is the range of scaffold porosity for which the distribution is valid, and what is the physical reason for such behavior. To do that, the p.d.f. of flow-induced stresses in different scaffold geometries were calculated via flow dynamics simulations. It was found that the direction of flow relative to the internal architecture of the scaffolds is important for stress distributions. The stress distributions follow a common distribution within statistically acceptable accuracy, when the flow direction does not coincide with the direction of internal structural elements of the scaffold.

Original languageEnglish (US)
Pages (from-to)235-247
Number of pages13
JournalBiorheology
Volume49
Issue number4
DOIs
StatePublished - Aug 10 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physiology
  • Physiology (medical)

Keywords

  • Constructed porous scaffolds
  • flow-induced stresses
  • perfusion reactor
  • stress distribution

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