Abstract:[Objective] To explore the factors impacting the postoperative outcomes of total knee arthroplasty (TKA) in hemophilia. [Methods] A retrospective study was conducted on 83 hemophilia patients (111 knees) who underwent TKA in our hospital from January 2012 to December 2020. Univariate comparison and multiple logistic regression analysis were used to explore the factors affecting the postoperative efficacy of TKA in hemophilia. [Results] All patients had significant improvement in knee function, mobility and knee score after operation. As result of univariate comparison, the excellent group proved significantly lesser than the poor group in terms of preoperative Hamilton depression scale(HAMD) [(5.1±2.3) vs (7.2±3.9), P=0.003], preoperative flexion contracture degree [(6.6±6.2)° vs (15.3±15.7)°, P= 0.003], preoperative VAS score [(2.6±1.02) vs (3.7±1.5), P<0.001], hemophilia severity classification [mild/medium/severe, (29/17/25) vs (1/ 8/31), P<0.001], and intraoperative blood loss [(522.5±172.5) mL vs (665.0±270.4) mL, P<0.001], intraoperative quadriceps plasty [yes/no, (0/71) vs (7/33), P<0.001], bilateral knee replacement under single anesthesia [yes/no, (20/51) vs (20/20), P=0.021],while the former was significantly greater than the latter in preoperative knee ROM [(88.2 ±13.6)° vs (46.2±23.2)°, P<0.001]. At the last follow-up, the excellent group was significantly greater than the poor group in HSS, KSS, KSF scores and postoperative knee ROM (P<0.05), while the former proved significantly lesser than the latter in remained extent of flexion contracture, the proportion of hematoma and the proportion of revision surgery (P<0.05). Based on the logistic regression analysis, the preoperative flexion contracture (OR=1.139, P=0.041) was an independent risk factor for poor outcome, while preoperative ROM (OR=0.872, P=0.027) was a protective factor. [Conclusion] TKA can significantly improve knee function in hemophilia, while the TKA consequence in hemophiliac is related to the preoperative ROM and the extent of flexion contracture. The better the preoperative knee motion, the better the outcome, and the greater the extent of preoperative flexion contracture, the worse the clinical consequence.