Crab can not be mashed and applied externally to treat bone fracture, you need to consult a regular hospital for treatment. The so-called crab mashed external application can treat fractures and other recipes or folklore, lack of scientific basis, the main components of the crab for the chitin, protein, calcium carbonate, etc., the direct external use of such components, the role of the internal fracture is minimal, generally unable to produce a direct therapeutic effect. And at present there is no relevant clinical cases or literature can prove that the external application of crab can clearly treat the fracture, so after the fracture, you still need to consult the regular hospital in a timely manner, to carry out X-ray and other examinations, to clarify the location of the fracture, the degree of the fracture, etc., the doctor will be given according to the situation of the specific treatment program, according to the doctor’s orders for treatment.