Table 1 The 2018 International Consensus Meeting (ICM) definition of PJI

Major Criteria

Diagnosis

Two positive cultures of the same organism

Infected

Sinus tract communicating with the joint or visualization of the implant

Minor Criteria (Preoperative Diagnosis)

Score

Diagnosis

Elevated CRP (100 mg /L) or Dimer (860 ng /ml)

2

 ≥ 6 Infected 2–5 Possibly Infected 0–1 Not Infected

Elevated ESR (30 mm /h)

1

Elevated synovial WBC count(3000//μl) or leukocyte esterase (+ +)

3

positive alpha-defensin

3

Elevated synovial PMN percentage (80%)

2

Elevated synovial CRP (6.9 mg /L)

1

Inconclusive pre-op score or dry tap (Intraoperative Diagnosis)

Score

Preoperative score

-

 ≥ 6 Infected 4–5 Inconclusive ≤ 3 Not Infected

Positive histology

3

Positive purulence

3

Single positive culture

2