CRP and juvenile polyposis syndrome: Serum CRP (cut-off 9 mg/L; AUC 0.85) and WBC count (cut-off 8 G/L; AUC 0.71), showed lower diagnostic accuracy.<h4>Conclusions</h4>This study establishes UKA-specific diagnostic thresholds for PJI, which are consistent with the EBJIS PJI criteria established for TKA.