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Infection of a prosthetic knee joint with Peptostreptococcus magnus
1Division of Rheumatology, Clinical Research Centre, Northwick Park Hospital, Harrow, Middlesex.
Annals of the Rheumatic Diseases
|October 1, 1988
Abstract:
Infection of a prosthetic knee joint with Peptostreptococcus magnus in an immunosuppressed patient with rheumatoid arthritis is described. The organism is a skin commensal, generally thought to be of low pathogenicity; the difficulty in making the diagnosis is emphasised.
Insights
Peptostreptococcus magnus, a low-pathogenicity skin commensal, caused a prosthetic knee joint infection in an immunosuppressed rheumatoid arthritis patient. Diagnosis was challenging due to the organism's typical low virulence.
Area of Science:
- Infectious Diseases
- Rheumatology
- Orthopedics
Background:
- Rheumatoid arthritis (RA) patients often require prosthetic joint replacements.
- Immunosuppression in RA patients increases susceptibility to opportunistic infections.
- Prosthetic joint infections (PJIs) pose significant clinical challenges.
Observation:
- A case of prosthetic knee joint infection is presented.
- The causative agent identified was Peptostreptococcus magnus.
- The patient had a history of rheumatoid arthritis and was immunosuppressed.
Findings:
- Peptostreptococcus magnus, typically a skin commensal with low pathogenicity, was implicated in a PJI.
- The diagnosis of PJI caused by this organism was difficult to establish.
- This highlights the potential for less common pathogens to cause severe infections in immunocompromised hosts.
Implications:
- Clinicians should consider less common bacterial species in the differential diagnosis of PJIs, especially in immunosuppressed patients.
- Enhanced diagnostic vigilance is crucial for identifying unusual pathogens in prosthetic joint infections.
- Understanding the pathogenicity of skin commensals in immunocompromised individuals is important for patient management.