I had a right rib resection almost three months ago for TOS.
My PT suggested a TENS unit and the TOS/vascular surgeon wrote a prescription for one.
PT gave it to me this week with a brief demonstration.
I've had it on the lowest settings for intensity on the back of my neck and front and back of my shoulder.
The only thing I've found in maybe 8 - 10 twenty minute treatments is that it may feel good for a few minutes but then my pain increases and I find my arm and neck getting extremely weak.
Gonna try and work with it for a while but so far I'm not impressed.
Also all the electric stim and ultra sound I've received over the last 18 months has done little to help except for the first few weeks of my injury.