In this case, if there is a fracture in the arm, it usually takes a month to fix it with plaster. But it depends on the degree of fracture. If the fracture is not serious, the plaster can be removed in advance without dislocation. If the swelling has subsided and there is no obvious pain, you can write properly, and at the same time, you should contract the activities of muscle ligaments to avoid complications such as local muscle atrophy and adhesion stiffness.