Diagnostic Criteria of the Post-Polio Task Force (Mulder et al, 1972):
(1) A prior episode of paralytic poliomyelitis with residual motor neuron loss.
(2) A period of neurologic recovery, followed by an interval of neurologic and functional stability. The interval of stability is usually >= 15 years.
(3) A gradual or abrupt onset of one or more of the following:
(3a) new weakness or abnormal muscle fatigue (decreased endurance)
(3b) muscle atrophy
(3c) generalized fatigue
(4) Exclusion of other conditions that could explain the findings in (3).
where:
• The previous episode of poliomyelitis with residual motor neuron loss may be confirmed by a typical patient history, a neurologic examination, or an electrodiagnostic examination.
• The interval o stability may range from 8 to 71 years.
• Other conditions to exclude include medical, orthopedic and neurologic disorders.
Halstead and Rossi (1987) modified these criteria slightly:
(2) The neurologic recovery involves partial to fairly complete neurologic and functional recovery.
(3) The onset of 2 or more of the following health problems since achieving a period of stability:
(3a) unaccustomed fatigue, muscle and/or joint pain
(3b) new weakness in muscles previously affected and/or unaffected
(3c) functional loss
(3d) cold intolerance
(3e) new atrophy
