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Microbiology of the infected total joint arthroplasty
1Department of Pathology, Wayne State University School of Medicine, Detroit, MI 48201, USA.
Abstract:
Infection associated with arthroplasty is a relatively rare event, but when it does occur, it is of major consequence for the patient. Many organisms can cause these infections, but most are the results of gram-positive bacteria, with the genus Staphylococcus accounting for at least 50%. Streptococcus and aerobic gram-negative bacilli are responsible for another significant percentage. The ability of the organism to produce a slime or glycocalix extracellular layer seems to be a contributing virulence factor for prosthesis-associated infections. Growth, identification, and susceptibility testing of the etiologic agent are performed by the microbiology laboratory, but antimicrobial treatment is usually only successful after removal of the prosthesis.
Insights
Arthroplasty infections are rare but serious, often caused by Staphylococcus bacteria. Successful treatment typically requires prosthesis removal, as antimicrobial therapy alone is often insufficient.
Area of Science:
- Infectious Diseases
- Microbiology
- Orthopedic Surgery
Background:
- Arthroplasty infections, though infrequent, pose significant risks to patients.
- Gram-positive bacteria, particularly Staphylococcus species, are the most common causative agents.
- Bacterial slime or glycocalyx production is a key virulence factor in prosthesis-associated infections.
Purpose of the Study:
- To summarize the common etiologic agents of arthroplasty infections.
- To highlight the role of bacterial virulence factors in these infections.
- To discuss the implications for treatment strategies.
Main Methods:
- Review of common pathogens involved in arthroplasty infections.
- Analysis of bacterial virulence factors, such as slime production.
- Discussion of diagnostic and therapeutic approaches.
Main Results:
- Staphylococcus species account for at least 50% of arthroplasty infections.
- Streptococcus and aerobic gram-negative bacilli are also significant contributors.
- Bacterial slime layer is identified as a contributing virulence factor.
Conclusions:
- Arthroplasty infections necessitate prompt identification and susceptibility testing.
- Antimicrobial treatment is frequently unsuccessful without surgical removal of the infected prosthesis.
- Understanding causative agents and virulence factors is crucial for effective management.