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What is the Role of Serological Testing Between Stages of Two-stage Reconstruction of the Infected Prosthetic Knee?

  • Symposium: Periprosthetic Joint Infection
  • Published:
Clinical Orthopaedics and Related Research®

Abstract

Background

Two-stage exchange arthroplasty is the gold standard for treatment of infected TKA. The erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), and synovial fluid white blood cell (WBC) count with differential are often used to determine treatment response; however, it is unclear whether these tests can answer the critical question of whether joint sepsis has been controlled between stages and if reimplantation is indicated.

Questions/purposes

We therefore asked if (1) these serologies respond between stage one explantation and stage two reimplantation during two-stage knee reconstruction for infection; and (2) changes in the values of these serologies are predictive of resolution of joint infection.

Methods

We retrospectively reviewed the serologies of 76 infected patients treated with a two-stage exchange protocol. The ESR, CRP, and aspiration were repeated a minimum of 2 weeks following antibiotic cessation and prior to second stage reoperation. Comparisons were made to identify trends in these serologies between the first and second stage procedures.

Results

Eight knees (12%) were persistently infected at the time of second stage reoperation. The ESR remained persistently elevated in 37 knees (54%), and the CRP remained elevated in 14 knees (21%) where infection had been controlled. We were unable to identify an optimum cutoff value for the ESR, CRP, or the two combined. The best test for confirmation of infection control was the synovial fluid WBC count.

Conclusions

Although the ESR, CRP, and synovial fluid WBC counts decreased in cases of infection control, these values frequently remained elevated. We were unable to identify any patterns in these tests indicative of persistent infection.

Level of Evidence

Level II, diagnostic study. See Guidelines for Authors for a complete description of levels of evidence.

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Authors and Affiliations

  1. Grant Medical Center, 340 East Town Street, Suite 7-250, Columbus, OH, 43215-5081, USA

    Sharat K. Kusuma MD, MBA

  2. Loyola University School of Medicine, New Orleans, LA, USA

    Joseph Ward BA

  3. The CORE Institute, Sun City West, AZ, USA

    Marc Jacofsky PhD

  4. Rush University Medical Center, Chicago, IL, USA

    Scott M. Sporer MD & Craig J. Della Valle MD

Authors
  1. Sharat K. Kusuma MD, MBA
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  2. Joseph Ward BA
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  3. Marc Jacofsky PhD
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  4. Scott M. Sporer MD
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  5. Craig J. Della Valle MD
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Corresponding author

Correspondence to Sharat K. Kusuma MD, MBA.

Additional information

Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

Each author certifies that his or her institution approved the human protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

This work was performed at the Rush University Medical Center, Chicago, IL.

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Kusuma, S.K., Ward, J., Jacofsky, M. et al. What is the Role of Serological Testing Between Stages of Two-stage Reconstruction of the Infected Prosthetic Knee?. Clin Orthop Relat Res 469, 1002–1008 (2011). https://doi.org/10.1007/s11999-010-1619-7

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  • DOI: https://doi.org/10.1007/s11999-010-1619-7

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