For classification of THR and TKR patients into primary arthroplasty group (PA), surgical revision group due to aseptic loosening (AL) and septic arthroplasty group (SL with confirmed coagulase-negative staphylococcal infection) according to the criteria of the Musculoskeletal Infection Society (MSIS), amongst others preoperative blood serum inflammatory parameters WBC and CRP levels were compared (Table 1). This evidence concerns the gene CRP and infection.