Related Experiment Video
Updated: May 6, 2026
Animal Model of Implant-Associated Infections in Mice
Published on: June 27, 2025
Establishment of a new methicillin resistant Staphylococcus aureus animal model of osteomyelitis
Lars Helbig1, Hans Georg Simank, Helga Lorenz
1Department of Orthopedics, Trauma Surgery and Paraplegiology, Heidelberg University Hospital, Heidelberg, Germany.
Purpose:
The increase in methicillin-resistant Staphylococcus aureus (MRSA) infections is currently a major health care problem. Vancomycin is still often the first-line anti-microbiological agent for treating such infections; however, a recent decline in efficacy of vancomycin in MRSA infections has raised concerns and accelerated the search for new antibiotics. The aim of this study was to establish a MRSA peri-implant osteomyelitis animal model for future testing of new anti-microbiological agents under typical MRSA infection conditions.
Methods:
Eighteen randomised NZW-rabbits underwent a standardised surgical procedure with the insertion of a femoral bone implant. Animals were then divided into group 1 (MRSA inoculation, no antibiotics; M/N), group 2 (MRSA inoculation, Vancomyin; M/V), and group 3 (no MRSA inoculation, no antibiotics; N/N). The primary study outcome parameters were animal leucocyte count, animal weight, and animal body temperature at one, seven, and 42 days after surgery. Additionally, a histo-morphometrical score was established and adjusted to a modified histological Smeltzer score.
Results:
Macroscopic and histo-morphometrical findings showed a peri-implant osteomyelitis in group 1 with both increased acute and chronic infection parameters in M/N, as compared to M/V and N/N, indicating that vancomycin treatment prevented typical morphological changes of MRSA peri-implant osteomyelitis. Similarly, there was a reduction in animal weight and increase in leucocyte count and body temperature in group 1 (each p < 0.005). Vancomycin treatment again resulted in significantly reduced leucocyte count and body temperature, and increased animal body weight.
Conclusions:
Here we have established a peri-implant MRSA osteomyelitis model that successfully combined clinical and laboratory outcome parameters of infection with histo-morphometrical results; this model appears to be valuable for future experimental use and therapeutic monitoring of new anti-microbiological MRSA drugs.
Insights
This study developed a new animal model for methicillin-resistant Staphylococcus aureus (MRSA) peri-implant osteomyelitis. The model effectively demonstrated infection parameters and vancomycin
Area of Science:
- Infectious Diseases
- Orthopedic Surgery
- Microbiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) infections pose a significant healthcare challenge.
- Declining vancomycin efficacy necessitates the development of novel antimicrobial agents.
- A robust animal model is crucial for evaluating new MRSA treatments.
Purpose of the Study:
- To establish a novel animal model for MRSA peri-implant osteomyelitis.
- To simulate typical MRSA infection conditions for therapeutic testing.
- To provide a platform for evaluating new anti-MRSA drugs.
Main Methods:
- Eighteen New Zealand White rabbits underwent surgery with femoral bone implant insertion.
- Animals were divided into MRSA inoculation with/without vancomycin, and control groups.
- Primary outcomes included leukocyte count, weight, body temperature, and histological scoring.
Main Results:
- The MRSA inoculation group (M/N) exhibited increased acute and chronic infection parameters.
- Vancomycin treatment (M/V) significantly reduced infection markers compared to M/N.
- The M/N group showed reduced weight and increased leukocyte count and body temperature.
Conclusions:
- A validated MRSA peri-implant osteomyelitis model was successfully established.
- The model integrates clinical, laboratory, and histo-morphometrical outcomes.
- This model is valuable for future research and therapeutic monitoring of anti-MRSA agents.
