There is fluid inside the bone, usually the result of MRI examination, the approach is as follows: First, if there is fluid inside the bone caused by trauma, there is no local redness, swelling, heat, pain and other infections, this is a local accumulation of blood or bloody tissues and caused by local immobilization treatment, and then apply blood circulation and eliminate blood stasis, reduce swelling and relieve pain of drugs to oral or external application, etc., are able to promote the absorption of the fluid to ease the Symptoms. Second, if there is no history of trauma, or bone trauma has been completely treated, and there is localized effusion accompanied by redness, swelling, heat and pain, this situation may be caused by osteomyelitis, it is necessary to give surgical treatment, through surgical incision, to remove the inflammatory tissues inside as well as necrotic bone, but also must be left with a drainage tube to fully drain, and then the use of antibiotics to the regular anti-infective treatment to be treated. The treatment can only be done if the patient is treated with antibiotics and regular anti-infective treatment.