Tibia fracture for six months how to ankle swelling may be fracture has not yet completely healed, serious soft tissue injury, lower extremity venous return obstruction and lymphatic obstruction, abnormal kidney function or abnormal heart function. 1. The fracture has not completely healed: due to the lower 1/3 of the tibia has less blood supply, the healing is slower, easy to cause delayed healing or even non-healing of the bone, the patient may appear patients may appear tibia fracture for six months ankle swelling. 2. Serious soft tissue injury: if the patient has serious muscle, blood vessel or nerve injury, and the wound is not treated in time, the patient may have tibia fracture for half a year with ankle swelling. 3. Lower extremity venous return obstruction and lymphatic obstruction: if the patient has lower extremity venous injury or lymphatic vessel injury, causing venous or lymphatic return obstruction, the patient may have tibia fracture ankle swelling for half a year. 4. Abnormal renal function or abnormal cardiac function: if the patient has abnormal renal function or abnormal cardiac function leading to metabolic or circulatory disorders, the patient may have tibia fracture ankle swelling for half a year. Tibia fracture for half a year how ankle swelling may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.