Lumbar vertebral burst fracture more than six months after surgery after a day of activity calf is still swollen, common causes are excessive exercise, muscle strength decline, lower extremity venous thrombosis. 1. Exercise overload: after a day of activity after the fracture, if the exercise is relatively large, causing lactic acid accumulation in the muscles of the lower limbs or a transient obstruction of blood circulation, it may cause swelling of the lower limbs, which can be relieved after resting in general. 2. Decrease in muscle strength: After lumbar spine fracture surgery, it is usually necessary to take a long time to rest in bed, at this time, the body’s activities are reduced, resulting in lower limb muscle atrophy and decrease in muscle strength, walking on the ground because of the lack of muscle strength, it is easy to lactic acid buildup after the activity, which causes pain, and it is a normal phenomenon. 3. Venous thrombosis: due to prolonged bed rest after the fracture, lower limb activities are significantly reduced, the blood circulation slows down after the abnormal agglutination, resulting in lower limb veins, can also cause swelling of the lower limbs. Caused by lumbar spine fracture surgery in June after the activities of the lower limbs after the swelling of more reasons, if the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease after targeted treatment.