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Nanopatterned Titanium Implants Accelerate Bone Formation In Vivo.

Andrew I M Greer1, Vitali Goriainov2, Janos Kanczler2

  • 1Division of Biomedical Engineering, School of Engineering, University of Glasgow, GlasgowG12 8LT, United Kingdom.

ACS Applied Materials & Interfaces
|July 8, 2020
PubMed
Summary

This study engineered titanium implants with nanotopographies to promote bone formation. The new method significantly increased osteogenic gene expression, offering a promising approach for orthopedic implants.

Keywords:
coatingosteogenesisprosthesissol−gelstem cell

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Area of Science:

  • Biomaterials Engineering
  • Orthopedic Research
  • Tissue Engineering

Background:

  • Accelerated de novo bone formation is crucial for treating musculoskeletal injuries, with current strategies relying heavily on biologic factors.
  • A need exists for cost-effective, reproducible methods to stimulate osteogenic cell responses for orthopedic implants.
  • Surface engineering offers a potential alternative to biologic factors for inducing osteogenesis.

Purpose of the Study:

  • To develop and validate a surface engineering method for creating bioactive nanopatterns on clinically relevant orthopedic materials.
  • To translate in vitro findings of nanopattern-induced osteogenesis to in vivo applications using metal implants.
  • To assess the osteoinductive potential of a novel titanium-based sol-gel nanopatterning technique.

Main Methods:

  • Utilized a titanium-based sol-gel process to create controlled disordered nanotopographies (15-25 nm height, 100 nm diameter pillars) on titanium dioxide surfaces.
  • Engineered metal implants with these specific nanotopographies for orthopedic applications.
  • Seeded implants with STRO-1-enriched human skeletal stem cells and performed in vivo subcutaneous implantation in mice.

Main Results:

  • Nanopatterned titanium dioxide surfaces demonstrated effective induction of osteogenesis in vivo.
  • Retrieval of samples after 28 days showed a 20-fold increase in osteogenic gene induction on nanopatterned substrates compared to controls.
  • The sol-gel nanopatterning method successfully translated bioactive nanopatterns to a clinically relevant metal material.

Conclusions:

  • The developed sol-gel nanopatterning method is a robust and reproducible strategy for inducing osteogenesis.
  • This surface engineering approach shows significant promise for the development of next-generation orthopedic implants.
  • The findings support the translation of this technique for clinical applications in musculoskeletal injury repair.