Hi.

It does sound like scarring and tightness...I am assuming they went ahead with the operation because the NCS showed that the conduction velocity was different proximal to the carpal tunnel compared to distal...

Was the patient's C/S checked at any stage (for differential diagnosis as Ginger suggests above)?

Is palpation of the nerve trunks of the C/S tender?

I can't believe this lady didn't have a course of physiotherapy before an operation at least to try alleviate the symptoms - especially after a fall onto the arm...

Neural mobilisations ala Bob Elvey, Michael Shacklock, David Butler etc might be handy, especially to decrease the neurosensitivity of the system.

Good luck - sounds interesting!