Biofilm-Associated Infections in Orthopedic Implants

Biofilm-associated infections in orthopedic implants represent a major clinical challenge, arising when microorganisms adhere to implant surfaces and produce a protective exopolymeric matrix. These sessile communities confer dramatic resistance to both host defences and antimicrobial agents, often necessitating prolonged systemic therapy, surgical debridement or implant revision. Staphylococcus aureus and coagulase-negative staphylococci remain the predominant pathogens, exploiting implant roughness and local tissue damage to establish persistent foci. Key reservoirs include biofilm on hardware, bacterial communities within necrotic bone and microcolonies in the osteocyte lacuno-canalicular network. The interplay between microbial adhesion molecules, host proteins such as fibrinogen and fibronectin, and the inflammatory milieu underpins both initial attachment and chronic persistence. Emerging strategies pursue targeted delivery of antibiotics, novel anti-adhesive and immunomodulatory coatings, three-dimensional scaffolds impregnated with local agents and non-antibiotic approaches to disrupt quorum sensing. A deeper understanding of biofilm architecture, bacterial–host interactions and local pharmacokinetics is essential to reduce morbidity, limit healthcare costs and improve long-term implant survival.

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Biofilm-Associated Infections in Orthopedic Implants publication trend

The graph below shows the total number of articles in biofilm-associated infections in orthopedic implants across all publications each year (not limited to Nature Index journals).

Technical terms

Biofilm: A structured community of microorganisms encased in a self-produced exopolymeric matrix adherent to a surface.

Periprosthetic Joint Infection (PJI): Infection occurring in the tissues surrounding a joint prosthesis, often involving biofilm formation.

Bisphosphonate-conjugated antibiotic: An antibiotic chemically linked to a bisphosphonate moiety to achieve selective delivery to bone tissue.

Immunonegative coating: A surface treatment that deters bacterial adhesion while reducing activation of local immune responses.

Osteocyte lacuno-canalicular network: A microscopic system of interconnecting channels in cortical bone that can harbour bacteria during chronic infection.

References

1. Evidence of bisphosphonate-conjugated sitafloxacin eradication of established methicillin-resistant S. aureus infection with osseointegration in murine models of implant-associated osteomyelitis. Bone Research (2023).
2. Antibacterial Immunonegative Coating with Biocompatible Materials on a Nanostructured Titanium Plate for Orthopedic Bone Fracture Surgery.. Biomaterials Research (2024).
3. Evolving concepts in bone infection: redefining “biofilm”, “acute vs. chronic osteomyelitis”, “the immune proteome” and “local antibiotic therapy”. Bone Research (2019).