Hi, thanks for writing to HCM.
Undisplaced fractue of the fibula
, after being treated with a cast for 4 weeks should not pose any problem for your son in future.
This is just to let you know that fracture
of the fibula carries no clinical significance as majority of the body weight is being borne by the TIBIA
(the big bone lying adjacent to the fibula on xrays).
A certain amount of pain, swelling and stiffness
is commonly encountered after removal of the cast. This is going to subside within no time.
In my opinion, your son will not have any problems with the fractured fibula in future and he can attend to all sorts of sporting activities as before.
Hope this information is helpful. Good day