. 2022 Apr 30;23:404. doi: 10.1186/s12891-022-05357-y

Table 1.

Definition of Periprosthetic Join Infection

PJI is diagnosed when patients meet one major criterion or 3/5 minor criteria
Major Criteria	Two positive periprosthetic cultures with phenotypically identical organisms, OR A sinus tract communicating with the joint
Minor Criteria	1) Elevated serum CRP and ESR values; 2) Elevated synovial fluid white blood cell (WBC) counts OR + + changes on leukocyte esterase test strip; 3) An elevated polymorphonuclear neutrophil percentage (PMN%) in the synovial fluid; 4) Positive histological analyses of the periprosthetic tissue; 5) A single positive culture

PJI is diagnosed when patients meet one major criterion or 3/5 minor criteria

Major Criteria

Two positive periprosthetic cultures with phenotypically identical organisms, OR

A sinus tract communicating with the joint

Minor Criteria

1) Elevated serum CRP and ESR values;

2) Elevated synovial fluid white blood cell (WBC) counts OR + + changes on leukocyte esterase test strip;

3) An elevated polymorphonuclear neutrophil percentage (PMN%) in the synovial fluid;

4) Positive histological analyses of the periprosthetic tissue;

5) A single positive culture