After 45 days of tibia fracture, the calf is not swollen and the swelling has gone down, so you can sit for a long time, but you should not hang down the affected limb when you sit, and you should pay attention to the change of position in order to prevent acne and other conditions. Sitting up in bed will not affect the healing of tibial fracture, so it is possible to sit for a long time. However, it is important to change your position every 1 to 2 hours to prevent acne caused by prolonged pressure on one part of the body. Be careful not to sit on the edge of the bed for a long time and let the affected limbs hang low, so as not to cause swelling of the affected limbs due to prolonged hanging low. During the period of bed rest, also under the guidance of the doctor to carry out functional exercise of the lower limbs, not because of the pain dare not exercise, and not excessive exercise. Functional exercise can prevent lower extremity venous thrombosis, joint stiffness and other complications.