For acute PJI, no significant difference between patients with (group A1) and without rheumatoid arthritis (group B1) were found (Table 3): Median CRP was 88.00 and 129.45 mg/L (p = 0.92), WBC count 9.13 and 9.93 cells/nL (p = 0.30), synovial WBC 60.75 and 48.92 cells/nL (p = 0.54), and synovial PMN cell count 55.89 and 48.24 cells/nL (p = 0.74), respectively. The gene discussed is CRP; the disease is rheumatoid arthritis.