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