Titanium with aligned, elongated pores for orthopedic tissue engineering applications

Erik D. Spoerke, Naomi G.D. Murray, Huanlong Li, L. Catherine Brinson, David C. Dunand, Samuel I. Stupp

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Porous titanium with elongated and aligned pores, mimicking the anisotropic structure of bone, was created by solid-state expansion of argon trapped in elongated pores between titanium wires. Both elastic moduli and yield strengths are larger in the longitudinal direction (E = 51 GPa, σ = 338 MPa) than in the transverse direction (E = 41 GPa, σy = 267 MPa). Finite-element analysis of simplified anisotropic structures provides insight into the local micromechanical behavior of these porous materials, evaluating elastic modulus, resistance to plastic deformation, and localized stress concentrations which may be experienced under biological loading. Preliminary in vitro cell culture studies further demonstrate the influence of the elongated porous microstructure on osteoblast colonization behavior. These studies suggest that as an optimized material, titanium with aligned, elongated pores is promising for applications in orthopedic tissue engineering, as it combines high strength, toughness, and biocompatibility of titanium with the reduced stiffness and open porosity suitable for mechanical integration with bone tissue produced by aligned pores.

Original languageEnglish
Pages (from-to)402-412
Number of pages11
JournalJournal of Biomedical Materials Research - Part A
Volume84
Issue number2
DOIs
Publication statusPublished - Feb 2008

Keywords

  • Anisotropy
  • Bone
  • Finite-element
  • Mechanical properties
  • Orthopedic tissue engineering
  • Osteoblasts
  • Titanium foam

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys

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