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Methylene Blue-Guided Debridement as an Intraoperative Adjunct for the Surgical Treatment of Periprosthetic Joint
Jeremy D Shaw1, Steve Miller2, Anna Plourde3
1Department of Orthopaedic Surgery, University of California, San Francisco (UCSF), San Francisco, California.
Background:
Current methods to identify infected tissue in periprosthetic joint infection (PJI) are inadequate. The purpose of this study was (1) to assess methylene blue-guided surgical debridement as a novel technique in PJI using quantitative microbiology and (2) to evaluate clinical success based on eradication of infection and infection-free survival.
Methods:
Sixteen total knee arthroplasty patients meeting Musculoskeletal Infection Society criteria for PJI undergoing the first stage of 2-stage exchange arthroplasty were included in this prospective study. Dilute methylene blue (0.1%) was instilled in the knee before debridement, residual dye was removed, and stained tissue was debrided. Paired tissue samples, stained and unstained, were collected from the femur, tibia, and capsule during debridement. Samples were analyzed by neutrophil count, semiquantitative culture, and quantitative polymerase chain reaction (PCR). Clinical success was a secondary outcome.
Results:
The mean age was 64.0 ± 6.0 years, and follow-up was 24.4 ± 3.5 months. More bacteria were found in methylene blue-stained vs unstained tissue-based on semiquantitative culture (P = .001). PCR for staphylococcal species showed 9-fold greater bioburden in methylene blue-stained vs unstained tissue (P = .02). Tissue pathology found 53 ± 46 polymorphonuclear leukocytes per high-power field in methylene blue-stained vs 4 ± 13 in unstained tissue (P = .0001). All subjects cleared their primary infection and underwent reimplantation. At mean 2-year follow-up, 25% of patients failed secondary to new infection with a different organism.
Conclusion:
These results suggest a role for methylene blue in providing a visual index of surgical debridement in the treatment of PJI.
Insights
Methylene blue staining aids in identifying infected tissue during periprosthetic joint infection (PJI) surgery, improving bacterial detection and guiding debridement for better outcomes.
Area of Science:
- Orthopedics
- Infectious Diseases
- Surgical Innovation
Background:
- Periprosthetic joint infection (PJI) diagnosis and treatment remain challenging.
- Current methods for identifying infected tissue in PJI are insufficient.
- Effective surgical debridement is crucial for successful PJI management.
Purpose of the Study:
- To evaluate methylene blue-guided surgical debridement for PJI using quantitative microbiology.
- To assess the clinical success of this technique, focusing on infection eradication and survival.
- To determine if methylene blue enhances the identification of infected tissue.
Main Methods:
- Prospective study of 16 total knee arthroplasty patients with PJI undergoing two-stage exchange.
- Methylene blue (0.1%) was used to stain and guide debridement of infected tissue.
- Paired stained and unstained tissue samples were analyzed via neutrophil count, semiquantitative culture, and quantitative PCR.
Main Results:
- Methylene blue-stained tissue showed significantly higher bacterial loads by semiquantitative culture (P=.001) and PCR for staphylococcal species (9-fold increase, P=.02).
- Stained tissue had a higher polymorphonuclear leukocyte count (53 vs 4, P=.0001), indicating inflammation.
- All patients cleared the initial infection; however, 25% experienced secondary infection with a different organism at 2-year follow-up.
Conclusions:
- Methylene blue staining serves as a valuable visual aid for surgical debridement in PJI.
- The technique enhances the detection of infected tissue, potentially improving treatment efficacy.
- Further research is needed to optimize its role in PJI management and reduce re-infection rates.
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