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Chronic staphylococcal osteomyelitis: a new experimental rat model
1Department of Microbiology, Catholic University of the Sacred Heart, Rome, Italy.
Abstract:
A rat model of chronic staphylococcal osteomyelitis was developed. Fibrin glue (5 microliters) and Staphylococcus aureus (2 x 10(6) CFU/5 microliters) were inoculated into the proximal metaphysis of the tibia. The rats were killed at intervals of between 1 and 6 months, and the tibias were removed. Induced lesions were evaluated by radiographic, macroscopic, and histological examinations and bacterial counts. Roentgenograms revealed osteomyelitis in more than 90% of the tibias. Gross bone pathology revealed skeletal deformation, new bone formation, abscesses, and draining skin fistulas in more than 80% of cases. Histological examination revealed osteomyelitis in more than 90% of cases, and bacterial counts were positive in 86% of cases. Only fibrin glue (5 microliters) was inoculated into controls. Controls showed no osteomyelitic lesions, and counts were negative in seven of eight control tibias. The main feature of this model is the use of fibrin glue instead of the sclerosing agents and foreign bodies used in other models. The model reproduces lesions similar to those of human posttraumatic osteomyelitis and can be reliably used in pathophysiological and therapeutic studies.
Insights
This study developed a reliable rat model for chronic staphylococcal osteomyelitis using fibrin glue and Staphylococcus aureus. The model effectively mimics human post-traumatic osteomyelitis, aiding future research.
Area of Science:
- Biomedical Science
- Infectious Disease Research
- Skeletal Biology
Background:
- Chronic osteomyelitis is a challenging bone infection.
- Existing animal models often use sclerosing agents or foreign bodies, which can confound results.
- A need exists for a more physiologically relevant model of post-traumatic osteomyelitis.
Purpose of the Study:
- To develop and validate a novel rat model for chronic staphylococcal osteomyelitis.
- To utilize fibrin glue as a biocompatible matrix for bacterial inoculation.
- To assess the reproducibility and characteristics of induced osteomyelitis lesions.
Main Methods:
- Induction of osteomyelitis in rat tibias using fibrin glue and Staphylococcus aureus.
- Evaluation of lesions through radiographic, macroscopic, and histological examinations.
- Quantification of bacterial load via bone cultures at various time points (1-6 months).
Main Results:
- Over 90% of inoculated tibias developed radiographic and histological evidence of osteomyelitis.
- More than 80% exhibited gross pathology including bone deformation and abscesses.
- Bacterial cultures were positive in 86% of cases, with control groups showing no lesions.
Conclusions:
- The fibrin glue-based rat model reliably reproduces chronic staphylococcal osteomyelitis.
- This model closely mimics human post-traumatic osteomyelitis.
- It is suitable for pathophysiological and therapeutic investigations.