To investigate the safety, cost-effectiveness, and clinical outcomes of simultaneous bilateral total knee arthroplasty (TKA) in hemophilic arthropathy (HA), the requirements for transfusions, complications, costs, hospital stays, Hospital for Special Surgery (HSS) knee scores, knee range of motion (ROM) and revision rates were compared between simultaneous bilateral and unilateral TKA in HA patients. A total of 36 patients and 54 knees were included. Compared to the unilateral group, the bilateral group did not require more transfusions (2.39 ± 3.13 vs 0. Hemophilic arthropathy (HA) is a common and occasionally inevitable complication that affects greater than 90% of patients with hemophilia before the age of 30 1 . Multiple joints, including the knee and hip, are often involved, leading to loss of function and permanent disabilities in end stage [2][3][4][5] (Fig. 1). The pathogenesis of HA begins with hemophilic synovitis induced by recurrent hemarthrosis, followed by joint erosion with cartilage damage and erosion of adjacent bones 6 . The most important approach to prevent HA involves eliminating intra-articular hemorrhage by regular factor replacement therapy (FRT) 7 . However, 70-80% of patients with hemophilia can not receive appropriate treatment and are thus at increased risk of developing HA 8 , and the knee joint is regarded as one of the most vulnerable joints 9 . Total knee arthroplasty (TKA) has been considered an optimal choice for treatment of HA [10][11][12][13][14][15][16] , and FRT is imperative in maintaining an adequate level of clotting factors to minimize blood loss perioperatively 8,17,18 . Given that HA of both knees is often involved, bilateral TKA is always unavoidable in the end stage. As staged bilateral TKA requires repeated clotting factor infusions that may induce the development of inhibitory against coagulation factors 19,20 as well as increases in hospitalization costs, simultaneous bilateral TKA may be considered a better treatment option. We conducted this retrospective study of 36 patients with a mean follow-up of 6 years to investigate the safety, cost-effectiveness, and medium-and long-term clinical outcomes of patients with end-stage HA receiving simultaneous bilateral TKA compared to unilateral TKA. We propose a hypothesis that the clinical results of simultaneous bilateral TKA were not inferior to unilateral TKA in HA patients.
MethodsStudy design. We searched the database of a single center for patients older than 18 years with end-stage HA (Fig. 2) who were treated with TKA from April 2005 to April 2015. The inclusion criteria were as follows: a) patients with hemophilia who had incapacitating HA; b) only TKA was performed during one admission.