Parvizi, J Arthroplasty 2014 - Definition of Periprosthetic Joint Infection

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Definition of Periprosthetic Joint Infection

Parvizi, International Consensus Group on Periprosthetic Joint Infection, et al.·J Arthroplasty·2014·910 citations·Consensus statement

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This 2014 editorial by Parvizi presents the International Consensus Group's definition of periprosthetic joint infection (PJI). Developed at a 2013 Philadelphia meeting of 400 experts from 52 countries, it modifies the 2011 MSIS criteria by updating the minor criterion threshold and adding leukocyte esterase. Diagnostic cutoffs for synovial WBC, CRP, and PMN% are stratified by whether the infection is acute (<90 days) or chronic (>90 days).

Key Findings

The threshold to diagnose PJI dropped with this consensus: three of five minor criteria now establishes the diagnosis, down from the original MSIS requirement of four of six.
- Major criteria (either alone confirms PJI):
- 1. Two positive periprosthetic cultures with phenotypically identical organisms
- 2. Sinus tract communicating with the joint
Leukocyte esterase was added as the fifth minor criterion — a rapid point-of-care strip test that expanded the diagnostic toolkit without requiring a laboratory send-out.
Synovial fluid thresholds are stratified by whether symptoms began before or after 90 days, because the inflammatory response differs between phases:
- Synovial WBC: 10,000 cells/μL (acute, <90 days) vs. 3,000 cells/μL (chronic, >90 days)
- CRP: 100 mg/L (acute) vs. 10 mg/L (chronic)
- PMN%: 90% (acute) vs. 80% (chronic)
- ESR: not useful in acute PJI / 30 mm/hr threshold in chronic PJI only
Histologic inflammation is held to the same standard regardless of acuity: >5 neutrophils per HPF across 5 high-power fields at ×400.
The criteria explicitly preserve a role for clinical judgment — Propionibacterium acnes and other low-virulence organisms can cause confirmed PJI without satisfying any numerical threshold, and the consensus states this directly.

Board PearlPJI diagnosis requires one major criterion OR three of five minor criteria, with thresholds stratified by acuity: acute (<90 days) vs. chronic (>90 days).

Definition of Periprosthetic Joint Infection.

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Definition of Periprosthetic Joint Infection

Parvizi, International Consensus Group on Periprosthetic Joint Infection, et al.·J Arthroplasty·2014·910 citations·Consensus statement

Free Full Text·DOI·PubMed

|

This 2014 editorial by Parvizi presents the International Consensus Group's definition of periprosthetic joint infection (PJI). Developed at a 2013 Philadelphia meeting of 400 experts from 52 countries, it modifies the 2011 MSIS criteria by updating the minor criterion threshold and adding leukocyte esterase. Diagnostic cutoffs for synovial WBC, CRP, and PMN% are stratified by whether the infection is acute (<90 days) or chronic (>90 days).

Key Findings

The threshold to diagnose PJI dropped with this consensus: three of five minor criteria now establishes the diagnosis, down from the original MSIS requirement of four of six.
- Major criteria (either alone confirms PJI):
- 1. Two positive periprosthetic cultures with phenotypically identical organisms
- 2. Sinus tract communicating with the joint
Leukocyte esterase was added as the fifth minor criterion — a rapid point-of-care strip test that expanded the diagnostic toolkit without requiring a laboratory send-out.
Synovial fluid thresholds are stratified by whether symptoms began before or after 90 days, because the inflammatory response differs between phases:
- Synovial WBC: 10,000 cells/μL (acute, <90 days) vs. 3,000 cells/μL (chronic, >90 days)
- CRP: 100 mg/L (acute) vs. 10 mg/L (chronic)
- PMN%: 90% (acute) vs. 80% (chronic)
- ESR: not useful in acute PJI / 30 mm/hr threshold in chronic PJI only
Histologic inflammation is held to the same standard regardless of acuity: >5 neutrophils per HPF across 5 high-power fields at ×400.
The criteria explicitly preserve a role for clinical judgment — Propionibacterium acnes and other low-virulence organisms can cause confirmed PJI without satisfying any numerical threshold, and the consensus states this directly.

Board PearlPJI diagnosis requires one major criterion OR three of five minor criteria, with thresholds stratified by acuity: acute (<90 days) vs. chronic (>90 days).

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