Calf nerve injury is mainly due to the damage of tibial nerve, superficial peroneal nerve and deep peroneal nerve in the calf. Usually there are two situations: first, the tibial bone or fibula fracture in the calf area, the broken end of the fracture causes compression and stimulation to the nerve or nerve fracture, which will lead to the decline of nerve conduction function, such as foot drop, distal sensory loss. Secondly, due to the strain or extrusion of the calf muscle, edema of the calf muscle will occur, and the inflammatory swelling will stimulate the nerve to produce compression, resulting in numbness due to ischemia of the calf nerve. Some patients due to injury to form aseptic inflammatory lesions, inflammatory metabolites stimulate the nerve, will also appear in the calf nerve sensory loss or numbness.