Results
blood loss, blood lossThe coagulation, DVT, infection, intermuscular venous thrombosis, TKA
BLOOD LOSS, INFECTION, INTERMUSCULAR VENOUS THROMBOSIS, INTRAOPERATIVE BLOOD LOSS, COMPLICATIONS, DVT
Seventy-seven patients scheduled for initial unilateral TKA participated in this trial, among which seven patients were excluded for the following reasons: four patients were ineligible according to the exclusion criteria and three patients declined to participate in this trial. The remaining 70 patients were randomly arranged into the control (n = 35) and ORC (n = 35) groups(Figure 
Flow chart of the patients included in the studyThe baseline data of the patients after admission were collected and analyzed. The results showed no statistical difference in the baseline data between the two groups, indicating that the two groups were comparable (Table 
Demographic baseline information of patientsBMI: body mass index. ASA grade: American Society of Anesthesiologists physical status classification. PBV: preoperative blood volume. PT: prothrombin time. PTA: prothrombin time activity. INR: international normalized ratio. APTT: activated partial prothrombin time. TT: thrombin time. FIB: fibrinogenTotal blood loss, Hb drop values, intraoperative blood loss, hidden blood loss, and operation time were statistically analyzed(Table 
Comparison of perioperative data of patients between the two groupsTBL: total blood loss. IBL: intraoperative blood loss. HBL: hidden blood lossThe coagulation indicators D-dimer and FDPs were tested before surgery and on 1 and 3 days after surgery, which demonstrated no statistical difference between the control and ORC groups (
Comparison of coagulation indicators of patients between the two groups
Comparison of perioperative inflammatory indexes of patients between the two groupsPostoperatively, patients in both groups were evaluated, and none of the patients received blood transfusion. During hospitalization and 6-week postoperative follow-up, 11 cases of intermuscular venous thrombosis and 5 cases of poor wound healing were observed in the control group, whereas 9 cases of intermuscular venous thrombosis and 4 cases of poor wound healing were found in the ORC group. No DVT, PE, or early infection was observed in either group(Table 
Complications during the 6-week follow-up (n, %)