Is there an aftermath of broken forearm?

Depends: It depends on the age group. The forearm bones rotate around each other so alignment with forearm fracture is very important. Poorly aligned fractures can lead to motion loss. Young children can often be treated with casting and can tolerate some misalignment. Adults typically need surgery for any displacement.

Not usually: Fractures of the forearm treated properly usually have no lasting problems, especially in children. Even fractures that require surgery and hardware usually heal with no limiting problems. If you have a problem after treatment, report the problem to the treating doctor. If the problem persists, please seek out a second opinion from an orthopedic surgeon (or a different orthopedic surgeon).

Aftermath?: In general, depending on the nature of the fracture and how it was treated, most people recover high function and have good results after a forearm fracture.

Potentially: Poor outcomes from forearm fractures can include pain, stiffness, and residual deformity. In a good outcome, patients can have no abnormalities what so ever.