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Fine needle aspiration in infected hip replacements
Abstract:
Ninety painful prosthetic hips from 88 consecutive patients underwent fine needle aspiration and the results compared with clinical progress, operative findings and culture. Fourteen of the 15 cases proven to be infected at operation were correctly identified by fine-needle aspiration. The one hip with a false negative aspirate had an arthrogram which showed a cavity suggesting infection. There were three false positive aspirates. One grew a different organism at surgery from the original aspirate. The other two had no growth on surgical culture. Both had had pre-operative antibiotics. Eleven cultures of doubtful significance were repeated or regarded as negative and the patients carefully followed-up. One repeat culture confirmed infection emphasizing the importance of repeating doubtful aspirates. The sensitivity of aspiration is 93%, specificity is 96%. The accuracy is 95% confirming that aspiration is a simple and reliable method of diagnosing infection in hip prostheses.
Insights
Fine needle aspiration accurately diagnoses prosthetic hip infections. This simple method has high sensitivity and specificity, proving reliable for identifying infected hip prostheses.
Area of Science:
- Orthopedics
- Infectious Diseases
- Diagnostic Imaging
Background:
- Prosthetic joint infections are a significant complication.
- Accurate diagnosis is crucial for effective treatment.
- Painful prosthetic hips require reliable diagnostic methods.
Purpose of the Study:
- To evaluate the diagnostic accuracy of fine needle aspiration (FNA) for prosthetic hip infections.
- To compare FNA results with clinical and operative findings.
- To determine the sensitivity, specificity, and accuracy of FNA in diagnosing hip prosthesis infections.
Main Methods:
- Fine needle aspiration was performed on 90 painful prosthetic hips from 88 patients.
- Results were compared with clinical progress, operative findings, and surgical cultures.
- Sensitivity, specificity, and accuracy were calculated.
Main Results:
- FNA correctly identified 14 out of 15 surgically confirmed infected hips (93% sensitivity).
- Specificity was 96%, with three false positives.
- Overall accuracy was 95%, indicating a reliable diagnostic method.
Conclusions:
- Fine needle aspiration is a simple, reliable, and accurate method for diagnosing prosthetic hip infections.
- Repeat aspiration of doubtful cultures is important.
- FNA aids in timely and appropriate patient management.