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Indian J Med Microbiol. 2019 Jan-Mar;37(1):67-71. doi: 10.4103/ijmm.IJMM_19_25.

Microbiological profile and outcomes of two-stage revision hip arthroplasty.

Author information

1
Department of Orthopaedic Surgery, Christian Medical College, Vellore, Tamil Nadu, India.
2
Department of Clinical Microbiology, Christian Medical College, Vellore, Tamil Nadu, India.

Abstract

Background:

Prosthetic joint infection (PJI) is one of the most challenging cases that confront modern orthopaedics. Two-stage revision, which is the standard of care for PJI, is the preferred mode of treatment for these infections.

Aims and Objectives:

To study the microbiological profile of prosthetic joint infections (PJI) in the hip and to assess the efficacy of a two stage revision surgery for PJI. We also aimed to study the sensitivity and specificity of ESR and CRP in the diagnosis of PJI.

Materials and Methods:

The microbiological profile, clinical and radiological outcomes of 22 patients who had a two-stage revision for PJI of the hip between 2013 and 2017 were retrospectively analysed. PJI was defined using the criteria provided by the International Consensus Statement on PJI 2013.

Results:

Staphylococcus aureus was found to be the most common organism in PJI. Debridement was successful in removing the organism in 74% of PJI. At the time of re-implantation (second stage), six joints grew organisms that were different from that isolated at the index debridement - coagulase-negative staphylococci (3cases) and enterococci (3cases). Other infection parameters for these patients were negative. None of the patients who had two-stage revision surgery had clinical evidence of reinfection or radiological evidence of loosening at a mean of 2-year follow-up. An ESR cut off of >30mm/hr had a sensitivity of 75% and specificity of 88% in predicting PJI. A CRP >10mg/L had a sensitivity of 75% and specificity of 69%. The sensitivity and specificity of using both ESR and CRP cut-offs in the diagnosis of infection were 57% and 94%, respectively. The positive predictive value was 94% and negative predictive value was 56%.

Conclusion:

The outcomes of the study justify a two-stage revision arthroplasty for PJI of the hip. The use of ESR and CRP as screening tests for the success of debridement has value - but should be interpreted with caution.

KEYWORDS:

Arthroplasty; C-reactive protein; diagnosis; erythrocyte sedimentation rate; microbiological profile; prosthetic joint infection

PMID:
31424013
DOI:
10.4103/ijmm.IJMM_19_25
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