Inability to turn up the toes after a knife cut to the calf may be combined with tendon injury or nerve injury, it is recommended to go to the hospital for wound exploration and surgical treatment of the damaged tissues. The movement of toes up requires the joint participation of nerves and muscles. If the sharp object damages the muscles or tendons such as bunion and extensor digitorum longus, or nerve tissues such as the deep peroneal nerve, the inability of toes up will be caused. Specifically, the identification of the muscle or nerve tissue injury needs to be based on the motor and sensory function of the lower limbs, and the combination of imaging and electromyography to make a comprehensive judgment if necessary. For simple muscle or tendon injuries, surgical sutures can be used to restore motor function, and rehabilitation training is needed; for nerve injuries, the severed nerve tissue needs to be connected, but more complex and lengthy rehabilitation training is needed. Seek medical attention if you have a limb movement disorder.