Post-polio syndrome

Post-polio syndrome (PPS, poliomyelitis sequelae) is a group of latent symptoms of poliomyelitis (polio), occurring at about a 25 to 40% rate (latest data greater than 80%). These symptoms are caused by the damaging effects of the viral infection on the nervous system. [Source: Wikipedia ]

OrphaNet reference
Post-poliomyelitic syndrome 
May Cause
Muscular atrophy