If the swelling of the affected limb does not subside significantly after the fracture: first, it is necessary to exclude whether it is caused by improper body position, generally most of the fractures of the lower limb need to elevate the affected limb, which can help blood return. Second, it is caused by too much activity. If the fracture is not healed, frequent movement of the affected limb or frequent dropping of the affected limb may lead to secondary edema of the affected limb. Once again, the fracture itself is serious, like a severe comminuted fracture, because the bleeding is more bruising absorption is quite slow, and it needs a long time of braking and treatment before it can be absorbed. Finally, complications after the fracture need to be excluded. If the whole affected limb is swollen and accompanied by obvious pain, it is highly suspected that there is deep vein thrombosis in the lower limb.