Generally, 4 to 6 weeks after the fracture, an X-ray is taken to show the appearance of a bone scab, which is able to have some resistance to rotational forces.
Fracture healing is divided into 3 stages, and scab formation is the 2nd stage.
The first stage of fracture is the stage of hematoma formation, which begins to coagulate into a blood clot 6 to 8 hours after injury and produces a sterile inflammatory reaction with the surrounding necrotic tissue.
With the hematoma mechanization began to form granulation tissue, which further evolved into fibrous connective tissue, these fibers will make the fracture broken end, initially connected together, at the same time, the fracture end of the periosteum near the bone osteoblasts are active proliferation, began to form the primitive bone scab, and this whole process takes about 4 to 6 weeks to complete, at this time can resist a certain degree of rotational force, that is, the fracture to achieve clinical healing.
After the bone scab grows out, the bone is further shaped and remodeled to form the same bone as the original, and this process takes about 1~2 years. With the gradual removal of the bone scabs, the bone parts are fully connected back to the normal bone structure, and complete healing is finally achieved.
Strenuous exercise should be avoided during the period of scab formation. Rehabilitation training can be done under the guidance of the doctor, such as rehabilitation training in bed or slow rehabilitation training on the ground, but secondary injuries should be avoided.