age all-polyethylene tibia antibiotics and implant retention arteriosclerosis arthroplasty bilateral bilateral knee replacement biomaterials blood loss body mass index cardio-ankle vascular index cementless complications debridement gap balancing haemophilia hemophilia hemostatic matrix implant survival influencing factors inhibitors instability knee knee arthroplasty lateral laxity leg axis leg axis alignment leg axis angles long-term results loosening