Is bone fusion surgery for a foot an effective treatment?

Yes: If it wasn't we would not recommend it.

Depends: It depends on what the surgery is trying to achieve and what bones are being fused. But in the proper scenerio it is very effective.

Can be: Depending on location, surgeon, age and health of the patient fusion can be very successful.

Fusion : As already stated , with the right approach and goal it can be very successful.