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Anaerobic bacteria in late infections following orthopedic surgery
Abstract:
Twelve patients with late anaerobic infection following hip or knee arthroplasty or tibia osteosynthesis are presented. Peptococci (Peptococcus asaccharolyticus, P. magnus, P. prevotii) and peptostreptococci (Peptostreptococcus micros, P. anaerobius, P. parvulus) were present in nine of the cases. Anaerobic gram-positive or -negative rods were found in three cases (Propionibacterium acnes, Actinomyces israelii, and Bacteroides fragilis). Antibodies against the isolated bacteria were detected in sera of nine patients. Anaerobic bacteria seem to be responsible for some of the late reactions that may follow arthroplasty or osteosynthesis.
Insights
Late anaerobic infections, including peptococci and peptostreptococci, can occur after hip or knee arthroplasty and tibia osteosynthesis. These infections may trigger immune responses, suggesting anaerobic bacteria cause some post-surgical reactions.
Area of Science:
- Medical Microbiology
- Orthopedic Surgery
- Infectious Diseases
Background:
- Late infections following orthopedic procedures like hip/knee arthroplasty and tibia osteosynthesis pose a clinical challenge.
- Anaerobic bacteria are increasingly recognized as potential pathogens in delayed post-surgical complications.
Purpose of the Study:
- To investigate the role of anaerobic bacteria in late infections after major orthopedic surgeries.
- To identify specific anaerobic bacterial species involved and assess host immune response.
Main Methods:
- Case series of twelve patients presenting with late infections post-arthroplasty or osteosynthesis.
- Bacteriological analysis of infected tissues to identify anaerobic organisms.
- Serological testing to detect antibodies against isolated anaerobic bacteria.
Main Results:
- Anaerobic bacteria, predominantly peptococci and peptostreptococci, were identified in nine out of twelve patients.
- Specific species included Peptococcus and Peptostreptococcus genera, with anaerobic gram-positive/negative rods (Propionibacterium acnes, Actinomyces israelii, Bacteroides fragilis) found in three cases.
- Antibodies against the isolated bacteria were detected in nine patients, indicating an immune response.
Conclusions:
- Anaerobic bacteria are implicated in a significant portion of late infections following hip/knee arthroplasty and tibia osteosynthesis.
- The presence of antibodies suggests a host immune response to these anaerobic pathogens.
- These findings highlight the importance of considering anaerobic infections in the differential diagnosis of late post-orthopedic surgery complications.