Hello
Hoping your father is doing fine and all will be okay once again.
It is difficult to comment without having a look at the xrays. Because there always is a scope for interobserver differentiation.
However , if undisplaced or minimally displaced ,spiral oblique fractures are having more area of contact at the fracture ends and can be managed conservatively.
Next Steps
xrays of affected limb knee with leg with ankle (anteroposterior and lateral view)
Health Tips
immobilisation in long posterior slab