Hi, thanks for writing to HCM.
Strictly speaking, there should not be any movement occuring at the fracture
site after a cast application.
It is possible to feel or hear a grating sensation from the fracture site when the fractured ends move over one other due to minimal movement. This minimal movement may occur if the cast becomes loose after the swelling at the fracture site settles down after some time.
An xray of the injured part clearly shows the formation of new bone (callus
) at the fracture site after 6 weeks. So serial xrays taken over monthly intervals will show up whether the fracture is uniting or not.
Hope this information is helpful. Good day