Fractures of this nature are easily missed. Unless there is a gross mis-alignment of the fractured pieces, the fracture may be missed until there is some calcification of the factured surfaces.
Your Post surgical recovery should be the same as if you had your surgery right away. 6 to 8 weeks for the bones to fuse and soft tissue to heal (baring any med problems or complications that may exist or occur). One thing that may extend your recovery will be the irritation that occurred due to Wt bearing on the unstable ankle. However it shouldn't extend it too long.
Good luck
OPI