Early formation of bone scab is not yet strong, with the increase and thickening of the bone scab, the later bone scab has a strong degree of resistance to shear force. A bone scab is a new bone that forms after a fracture injury, when bone-like tissue forms at the broken end of the healing process and continues to calcify, forming what is known as a bone scab. In the early stage, the amount of bone scab is small, the hardness of calcification is low, mainly connecting the broken ends of the fracture, i.e., connecting the bone scab, so the bone scab is not yet strong. As the new bone continues to increase and thicken, the connecting bone scab gradually forms a bridge scab, i.e., the primitive bone scab is formed. The primitive scab, through a mechanism of continuous calcification, is capable of resisting muscle contraction, shear, and rotational forces, and only then does it become reliably strong. This level of solidity is also a sign of clinical healing. Therefore, the solidity of the scab is mainly determined by the formation of the scab and the healing process.