The common causes of yellow water flowing all the time when the leg is knocked out include tissue fluid exudation in the acute stage, wound infection, sinus tract formation, etc., which need to be treated according to the condition. Tissue fluid exudation: After the leg is broken, the local skin is broken and the subcutaneous soft tissue loses the protection of the skin, so there will be tissue fluid exudation and yellow water will flow out from the wound. At this time, you need to use iodophor and saline to clean and disinfect the wound, and change the medicine regularly. 2. Bacterial infection: If the leg is not sterilized properly, the bacteria will invade and cause infection, and the yellow water coming out of the wound will be inflammatory oozing. At this time, in addition to the need to use povidone-iodine and other disinfectant to wipe disinfection, regular change of medicine, but also need to take amoxicillin, cefaclor and other antibiotic treatment. 3. Sinus tract formation: the leg is not healed for a long time after cracking, and there is yellow water continuously, may be due to the formation of sinus tract. Simply disinfecting and changing medicines cannot improve the situation, and it is necessary to perform sinus incision and drainage under anesthesia or sinus excision surgery in the clinic. The specific situation is recommended to go to the hospital, complete the auxiliary examination, in order to clarify the condition, the professional physician for the condition of the appropriate treatment.