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Updated: Jan 20, 2026
Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
Published on: February 9, 2011
A new small animal model for simulating a two-stage-revision procedure in implant-related methicillin-resistant
Maximilian Brunotte1, Markus Rupp2, Sabine Stötzel3
1Laboratory of Experimental Trauma Surgery, Justus-Liebig-University Giessen, 35392 Giessen, Germany; Department of Visceral, Transplantation, Vascular and Thoracic Surgery, University Hospital of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany.
Background:
Implant-related bone infections with methicillin-resistant Staphylococcus aureus (MRSA) remain a challenge for orthopedic surgeons. This devasting complication may lead to functional impairment and loss of the affected limbs. High failure rates in treatment make improvement of surgical treatment necessary. Beside an already established demanding and costly large animal model, a small animal model of a two-stage revision does not exist, yet. Thus, the purpose of this study was to establish a preclinical small animal model to simulate a two-stage revision in implant-related MRSA infection.
Materials And Methods:
In twelve rabbits Steel K-wires were implanted into the intramedullary canal of the left tibia, followed by inoculation with MRSA. Two different clinical isolates of MRSA-strains were used in two different concentrations (CFUs; 105 and 107 colony forming units (CFUs). This led to four groups of three rabbits each. Eleven rabbits survived the whole study period. After four weeks the inoculated K-wires were removed and replaced with vancomycin loaded PMMA-spacers (stage 1). Twenty-eight days later new K-wire implants were placed intramedullary (stage 2). After 84 days all animals were sacrificed. Tibiae were analyzed microbiologically, radiologically and histologically.
Results:
In every rabbit K-wire associated infection could be established within the first four weeks. After irrigation and debridement at revision one (stage 1), infection could be eradicated in 67% of group I, in 50% of group II and in 33% of group III and IV. Recurrence of the infection could be determined in all animals of group I and IV at day 84. X-ray analysis and histology both demonstrated clear signs of osteomyelitis after twelve weeks. Survival, clinical observations and weight assessment confirmed the ethical justifiable stress of the animals during the experiment.
Conclusion:
The presented small animal model of a two-stage revision in implant-related infection is a promising preclinical set-up for assessment of new treatment strategies of implant-related infections. Both high survival as well as reinfection rates were possible by simulating the clinical gold standard of two-stage revision surgery in an MRSA implant-related infection model. Therefore, the model can be deemed suitable for further preclinical in vivo testing.
Insights
A new small animal model effectively simulates two-stage revision surgery for methicillin-resistant Staphylococcus aureus (MRSA) implant infections. This preclinical model is crucial for testing new treatment strategies against challenging bone infections.
Area of Science:
- Orthopedics
- Infectious Diseases
- Veterinary Medicine
Background:
- Implant-related bone infections caused by methicillin-resistant Staphylococcus aureus (MRSA) pose significant challenges in orthopedic surgery.
- These infections can lead to severe functional impairment and limb loss, necessitating improved treatment strategies.
- A validated small animal model for two-stage revision surgery in MRSA implant infections was previously unavailable.
Purpose of the Study:
- To establish a preclinical small animal model simulating a two-stage revision procedure for implant-related MRSA infections.
- To provide a platform for evaluating novel therapeutic interventions in a controlled setting.
Main Methods:
- Twelve rabbits underwent intramedullary K-wire implantation in the tibia, followed by inoculation with MRSA (two strains, two concentrations).
- Stage 1 involved K-wire removal and insertion of vancomycin-loaded PMMA spacers.
- Stage 2, 28 days later, included new K-wire implantation, with sacrifice at 84 days for analysis.
Main Results:
- Successful establishment of K-wire associated MRSA infection in all rabbits.
- Initial infection eradication rates varied by group (33-67%) after stage 1.
- Recurrence of infection was observed in all animals by day 84, with clear radiological and histological signs of osteomyelitis.
Conclusions:
- The developed small animal model successfully simulates two-stage revision surgery for MRSA implant-related infections.
- The model demonstrates high survival and achievable reinfection rates, mimicking clinical scenarios.
- This preclinical model is suitable for further in vivo testing of new treatment strategies for implant-related infections.
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