Outcome assessment
malrotation, blood loss, knee arthroplasty, venous thromboembolism, femoral bowing
BLOOD LOSS, SECONDARY, COMPLICATIONS
The primary outcome was the accuracy of the radiographic parameter of the knee implant at 3 months after surgery. The postoperative radiograph was taken after the knee can full extend. The radiographs were performed according to the standard protocol. The radiograph was repeated, if the malrotation of the knee or flexion of knee was seen. The mechanical alignment (the angle between hip-knee axis and knee-ankle axis on the scanography, MA), anatomical alignment (the ankle between femoral axis and tibial axis on the scanography, AA), femoral bowing angle (the ankle between the axis of proximal third femur and the axis distal third femur on the scanography, FBA) were measured on the full-length weight-bearing radiograph according to the method described by Ehrendorfer et al. [The radiographic parameters of total knee arthroplasty. MA: mechanical alignment (the angle between hip-knee axis and knee-ankle axis on the scenography), AA: anatomical alignment (the ankle between femoral axis and tibial axis on the scanography,), FBA: femoral bowing angle (the ankle between the axis of proximal third femur and the axis distal third femur), CFA: coronal femoral component angle (the angle of femoral component formed with the anatomical axis of femur on coronal view), CTA: coronal tibia-component angle (the angle of femoral component formed with the anatomical axis of tibia), SFA: sagittal femoral component angle (the angle between anatomical axis of the femur and perpendicular line to femoral prosthesis on the lateral view), STA sagittal tibial component angle (the angle between anatomical axis of the femur and perpendicular line to tibial prosthesis)The secondary outcomes included total blood loss (TBL), transfusion rate, surgical wound length, wound complications, and the risk of venous thromboembolism. The TBL was calculated according to Nadler et al. [