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Table 1 Definition of Periprosthetic Joint Infections according to the EBJIS criteria and Musculoskeletal Infection Society

From: Poor outcome of octogenarians admitted to ICU due to periprosthetic joint infections: a retrospective cohort study

EBJIS criteria
I Clinical: sinus tract (fistula) or purulence around prosthesis
II Cell count in joint aspiration: >  2000/μl leukocytes or > 70% polymorphonuclear granulocytes (PMN)
III Histology: inflammation in periprosthetic tissue (type 2 or 3 after Krenn Morawietz)
IV Microbial growth in synovial fluid or > = 2 tissue samples (in cases of high virulent microbes like Staphylococcus aureus one sample is considered sufficient) or sonication fluid ≥50 CFU/ml
A PJI is diagnosed if at least one of the following criteria is fullfilled
Musculoskeletal Infection Society criteria
Definition of Periprosthetic Join Infection According to the International Consensus Group. This Is An Adaptation of the Musculoskeletal Infection Society Definition of PJI.
PJI Is Present When One of the Major Criteria Exists or Three Out of Five Minor Criteria Exist
Major Criteria
Two positive periprosthetic cultures with phenotypically identical organisms, OR
A sinus tract communicating with the joint, OR
Minor Criteria
1) Elevated serum C-reactive protein (CRP) AND erythrocyte sedimentation rate (ESR)
2) Elevated synovial fluid white blood cell (WBC) count OR ++change on leukocyte esterase test strip
3) Elevated synovial fluid polymorphonuclear neutrophil percentage (PMN%)
4) Positive histological analysis of periprosthetic tissue
5) A single positive culture