It is not necessary to remove the cast for 40 days, it depends on the patient’s specific recovery situation to determine. If the fracture has been immobilized for 40 days, theoretically the cast can be removed, but the specific situation depends on the recovery status of different patients. It is recommended to take X-ray to check the healing condition, if the fracture has reached the clinical healing standard, the cast can be removed; if the healing condition is not very good, the cast can not be removed first. How long to remove a fracture cast generally depends on the location of the fracture, the degree of injury and the healing of the fracture. Generally, it is not recommended to remove the cast too early to avoid the fracture site not fully healed, causing secondary injuries, resulting in deformity or affecting the normal function of the fracture site. In addition, the removal of the cast needs to be operated by a doctor, and after the removal of the cast, the patient also needs to avoid large movements and physical labor, and pay attention to rest more.