Table 2.

MSIS definition for PJI and threshold values for minor criteria [58]

	Periprosthetic joint infection is defined as:
Major criteria	Two periprosthetic cultures with identical organisms or A sinus tract communicating with the joint or
Minor criteria	Three of the following five minor criteria - Elevated CRP and ESR - Elevated synovial WBC count or positive luekocyte esteraste test trip (synovial fluid) - Elevated synovial fluid PMN% - Positive histological analysis of periprosthetic tissue - A single positive culture
Threshold values	Acute PJI (< 6 weeks from surgery): CRP > 100 mg/L, ESR not useful, synovial WBC > 10 k cells/uL, PMN% > 90% Chronic PJI (> 6 weeks from surgery): CRP >10 mg/L, ESR > 30 mm/h, synovial WBC > 3 k cells per uL, PMN% > 80%