Denervation

  : : :
  : : : This is probably a clearer question to a similar one asked just previously,
  : I read in a recent forum answer that isolated denervation of one single muscle very rarely evolves into ALS. Far more likely are local injuries to muscle/nerve, nerve injuries, or nerve root problems ("nerve pinched in the spine").So are you saying that in the case of ALS would you expect the EMG to pick up denervation in a few or several muscles?
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Denervation should be picked up in several muscles to make the diagnosis
of ALS, as a matter of fact the criteria to diagnose the disease demand that
the denervation changes be  found in different parts of the body, not just
one limb.
Isolated denervation is likely to be due to local damage to a nerve
or nerve root.