Won't emg to test obturator neuropathy secondary to fascial tethering in sports medicine not work b/c emg only shows severe denervation?

Hard to pick up: You are correct that EMG rarely picks up purely sensory problems and most of the time more moderate to severe denervation has to be present to pick this up.

Not necessarily: Electrodiagnostic (edx) studies consist of nerve conduction tests and emg. The EMG part picks up more severe denervation but the ncs can be abnormal in even milder cases. Obturator neuropathy from fascial tehtering is rare but an edx test still may be helpful.

Probably: Emg's are helpful (when done well)to confirm nerve compression. If your symptoms have not been going on ' long enough' than they commonly are " negative". So yes an obturator nerve compression would have to fairly severe and long- standing to be " picked up". Good luck!