The presence of a nerve on the bone is evidenced by the following points: 1. In the case of a fracture, a person will experience severe pain due to friction at the fracture end, and the reason why there is pain is because of the obvious friction at the fracture end. The reason why there is pain is because of the presence of nerves to feel the pain; 2. In the case of bone disease, such as a tumor on the bone, there will be local chronic swelling and pain, and the reason why there is pain is to prove the presence of nerves; 3. If there is bone necrosis, such as femoral head necrosis or other bone necrosis, there will be local pain, swelling, etc., and these can also These can also indicate the presence of local nerves. Therefore, the presence of nerves on the bone and pain can prove the existence of nerves.