Why Polio affected persons cannot be leg-transplanted ?

Answer 1

Polio is a virus that, in its worst cases, affects the entire body. Paralytic polio, as its name implies, causes muscle paralysis - and can even result in death. In paralytic polio, the virus leaves the intestinal tract and enters the bloodstream, attacking the nerves (in abortive or asymptomatic polio, the virus usually just stays in the intestinal tract). The virus may affect the nerves governing the muscles in the limbs and the muscles necessary for breathing, causing respiratory difficulty and paralysis of the arms and legs.

So, removing the legs would not remove the polio.

Answer 2

It is the nerves which are affected and destroyed.Not the leg;although it is visible as paralysis of legs.The nerve cells which are destroyed do not regenerate.Hence,the muscles of the leg can not function without the stimulation by the nerves and finally, undergo disuse atrophy.So,transplanting a leg would not help.