How to determine whether the fracture has reached clinical healing? Clinical healing criteria for fracture: (1) No local pressure pain and longitudinal percussion pain; (2) No local abnormal activity; (3) Fracture line is blurred on x-ray, and there is continuous bone infatuation through the fracture line; (4) The injured limb meets the following requirements after the external fixation is released: the upper limb can lift 1 kg of weight forward for 1 minute, and the lower limb can walk continuously on the flat ground for 3 minutes without crutches, not less than 30 steps; (5) Continuous observation for two weeks The fracture is not deformed.