A trilogy antimicrobial strategy for multiple infections of orthopedic implants throughout their life cycle

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Infectious Diseases

Background:

• Orthopedic implant failure is often caused by bacteria-associated infections.
• Conventional antimicrobial treatments struggle against recurrent infections during revision surgeries.
• Introducing new pathogens during implantation procedures exacerbates infection risks.

Purpose of the Study:

• To develop and evaluate a novel antimicrobial trilogy strategy for orthopedic implants.
• To create a multilayered coating system with multiple ion exchange mechanisms and nanotopography.
• To ensure effective eradication of bacterial infections at various implantation stages and promote osseointegration.

Main Methods:

• Fabrication of a sophisticated multilayered coating system.
• Incorporation of nanotopography for early-stage bacteriostatic effects.
• Doping calcium phosphate (CaP) coating with zinc for sustained ion release.
• Utilizing a zinc titanate fiber network for long-term antibacterial effects.
• In vivo implantation model to assess antibacterial potency and osseointegration.

Main Results:

• The coating demonstrated effective eradication of bacterial infection at various stages.
• Early-stage bacteriostatic effect achieved through nano-topological structures.
• Sustained release of zinc ions from CaP coating provided intermediate-stage antibacterial action.
• Long-term antibacterial ability against Staphylococcus aureus and Escherichia coli maintained by zinc titanate fiber network.
• Sustained release of Sr2+ and Zn2+ promoted osseointegration and new bone formation, improving bone-implant bonding strength even in infectious conditions.

Conclusions:

• The antimicrobial trilogy strategy offers a robust solution for combating orthopedic implant infections.
• The multilayered coating system effectively eradicates bacteria and promotes implant osseointegration.
• This approach holds significant potential for improving outcomes in arthroplasty and revision surgeries.