F2 and juvenile polyposis syndrome: There were slight increases in prothrombin time (PT), international normalized ratio (INR) and activated partial thromboplastin time (APTT) and significant increases in FIB, ESR, serum D-lactate, synovial D-lactate, SF WBC count and SF PMN% (p < 0.05), while there was no significant difference in the coagulation biomarker of thrombin time (TT) between the PJI group and the aseptic group (p > 0.05).