Experimental implant-related osteomyelitis induced withStaphylococcus aureus

Area of Science:

• Orthopedic Surgery
• Infectious Diseases
• Pharmacology

Background:

• Prosthetic joint infections pose a significant clinical challenge.
• Developing reliable animal models is crucial for evaluating infection prevention strategies.

Purpose of the Study:

• To establish and validate a rabbit knee-implant infection model.
• To assess the efficacy of local (gentamicin-impregnated bone cement) and systemic (intravenous dicloxacillin) antibiotic prophylaxis against Staphyloccus aureus knee infection.

Main Methods:

• Experimental knee-implant infection induced in rabbits using Staphyloccus aureus.
• Administration of gentamicin-impregnated bone cement or intravenous dicloxacillin.
• Control group received no antibiotics.
• Monitoring via clinical, microbiological, histological, and antibody analyses.
• Gentamicin levels measured in bone and joint fluid.

Main Results:

• The control group exhibited manifest inflammation and increased antibody titers.
• No bacteria were detected around the prosthesis in groups receiving antibiotic prophylaxis.
• High gentamicin concentrations were found in bone, but not in joint fluid.
• The animal model successfully replicated key aspects of human prosthetic joint infection.

Conclusions:

• Prophylactic antibiotic administration, whether local or systemic, effectively prevents experimental Staphyloccus aureus knee-implant infections.
• The validated rabbit model is suitable for studying bacterial dissemination and evaluating prophylactic interventions in prosthetic joint replacement.
• Further research can explore optimal antibiotic delivery methods and agents for preventing implant-associated infections.