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Two-dimensional nanocoating-enabled orthopedic implants for bimodal therapeutic applications.

Song Wang1, Chunyan Duan2, Weizhong Yang3

  • 1College of Materials Science and Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China. dengyibandeng@scu.edu.cn and Department of Spine Surgery, the Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.

Nanoscale
|May 28, 2020
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Summary

This study developed a novel nanocoating for polyetheretherketone (PEEK) orthopedic implants, enhancing bone integration and fighting infection through combined therapies. The innovative material shows promise for improved bone repair and infection management.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Nanotechnology

Background:

  • Polyetheretherketone (PEEK) is a promising orthopedic material due to its chemical durability and bone-like mechanical properties.
  • The bioinert nature of PEEK limits its clinical use in managing bone infections.
  • Developing functionalized PEEK implants is crucial for enhanced therapeutic outcomes.

Purpose of the Study:

  • To engineer a multifunctional two-dimensional (2D) nanocoating for porous sulfonated PEEK (SPEEK) implants.
  • To evaluate the nanocoating's ability to improve osseointegration and combat bone infections.
  • To create PEEK implants with enhanced cytocompatibility and osteogenic potential.

Main Methods:

  • Assembled graphene oxide (GO) nanosheets, polydopamine (pDA) nanofilm, and oligopeptide onto SPEEK surfaces.
  • Utilized π-π stacking for GO/pDA complex anchoring.
  • Conducted in vitro assessments of cytocompatibility, alkaline phosphatase activity, and gene expression.
  • Performed in vivo animal experiments using a rabbit femur defect model.

Main Results:

  • The multifunctional nanocoating significantly enhanced cytocompatibility, alkaline phosphatase activity, and calcium matrix deposition.
  • In vivo studies demonstrated improved osseointegration and bone remodeling in rabbit femur defects.
  • The GO/pDA hybrid complex exhibited robust antibacterial phototherapy via synergistic photothermal/photodynamic effects.
  • The modified SPEEK implants showed enhanced osteogenesis-associated gene expression.

Conclusions:

  • The developed 2D nanocoating effectively imbues PEEK implants with osteogenic and antibacterial properties.
  • This approach provides a versatile platform for creating advanced orthopedic implants with multimodal therapeutic applications.
  • The study offers a paradigm for overcoming the bioinertness of PEEK for bone infection management and repair.