How long can a cast be removed after a bone fracture cannot be generalized, but is mostly related to the severity of the fracture as well as the patient’s own age and health status. Bone fracture is a type of fracture, also known clinically as a crack fracture, which is mostly caused by a fall, impact and other factors. Under normal circumstances, if the patient is in good health and the bone fracture is mild, it is relatively easy to treat, and generally the patient can remove the cast and recover in about 1.5 months after external fixation in plaster, and the prognosis is good. However, if the patient’s bone fracture is more serious or even completely broken, or if the patient is older and in poor physical condition, the recovery time will be relatively longer, and it usually takes about 2-3 months to remove the cast. During the treatment period, patients should pay attention to rest and avoid overexertion. After removing the cast, they should carry out functional exercises under the guidance of doctors as soon as possible to promote the recovery of the limb.