After calf flap surgery, the lack of sensation in the lower part of the leg may be due to abnormal sensory function in the surgical area or distal part of the surgery, and postoperative local edema and stasis, and local nerve damage are the most common causes. Calf flap surgery belongs to microsurgery, after surgery, local edema, vasospasm, surgical infection, vascular embolism and other related conditions may occur, if the surgical process of nerve damage or postoperative local edema, may lead to lower extremity skin sensory function, causing numbness, no feeling of the symptoms of sensory abnormality of the time may be long or short. When the local edema dissipates and the damaged nerve function recovers, the lack of local sensation will gradually improve. After calf flap surgery, you should closely observe the local blood circulation supply, clean and disinfect the area in time, and follow the doctor’s instructions to actively anti-infection, anti-thrombosis, anti-vascular spasm, anti-swelling and analgesic (eliminating swelling and pain) symptomatic treatment, as well as regular review of the progress of postoperative recovery. If the above symptoms appear, you should consult the doctor in time and take active treatment so as not to delay the condition.