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Gram stain detection of infection during revision arthroplasty
G F Chimento1, S Finger, R L Barrack
1Tulane University School of Medicine, New Orleans, Louisiana 70112, USA.
Abstract:
We reviewed 194 revision arthroplasties of the hip and knee performed over a ten-year period. The results of intraoperative Gram staining were available in 169 (87%). Thirty-two were found to be infected (11 hips and 21 knees) and 137 had no evidence of infection. Intraoperative Gram staining was negative in all 169 cases. The method therefore had a sensitivity of 0% for detecting infection. We conclude that the absence of organisms on intraoperative Gram staining during revision arthroplasty does not confirm the absence of infection.
Insights
Intraoperative Gram staining is unreliable for detecting infection during revision hip and knee arthroplasty. A negative result does not rule out infection, necessitating further diagnostic methods for accurate diagnosis.
Area of Science:
- Orthopedic Surgery
- Infectious Disease Diagnostics
- Medical Microbiology
Background:
- Revision arthroplasty is a complex procedure often associated with infection risk.
- Accurate and timely diagnosis of periprosthetic joint infection (PJI) is crucial for successful treatment outcomes.
Purpose of the Study:
- To evaluate the diagnostic utility of intraoperative Gram staining in identifying infection during revision hip and knee arthroplasty.
- To determine the sensitivity of Gram staining for detecting infection in this patient population.
Main Methods:
- A retrospective review of 194 revision arthroplasties (hip and knee) over a ten-year period.
- Analysis of intraoperative Gram staining results from 169 procedures where data was available.
Main Results:
- Thirty-two cases (19%) were identified as infected (11 hip, 21 knee).
- Intraoperative Gram staining yielded negative results in all 169 cases reviewed.
- The sensitivity of intraoperative Gram staining for detecting infection was calculated to be 0%.
Conclusions:
- Intraoperative Gram staining demonstrates a lack of sensitivity for diagnosing infection in revision arthroplasty.
- A negative Gram stain result should not be interpreted as confirmation of the absence of infection.
- Alternative diagnostic methods are essential for the reliable detection of infection in revision arthroplasty procedures.