1.Inquire about the primary fracture and the development of the disease, understand the treatment, and observe whether the cast or dressing is too tight. 2.Local examination should pay attention to the swelling of the affected limb, if the tension is too high, tissue manometry should be performed if possible, and prophylactic fasciotomy is feasible if necessary. Note whether there are symptoms of distal limb ischemia, such as severe pain, swelling, skin color change, weak or inactive fingers (toes), dull sensation, diminished or absent pulse, etc., and whether passive movement of fingers (toes) causes pain. It should be noted that the above symptoms or signs are more advanced manifestations. 3, there are clear signs of vascular injury, such as popliteal artery compression, if necessary, viable angiography.