The scores based on OR were : age 35 years : 1 point , > 35 - < 65 years : 4 points , 65 years : 6 points ; length of time before surgery , < 8 days :1 point , 8 days :2 points ; low-energy injury :1 point , high energy injury :3 points ; location of injury , foot and ankle :1 point , calf :3 points , around the knee : 5 points , femoral diaphysis and proximal femur :7 points , pelvis and acetabulum :4 points , 2 sites :6 point ; history of cardiovascular and cerebrovascular diseases , yes :2 points , no :1 point .