I was so happy to find this sight, but this thread in particular. I think I may have an accessory nerve injury. I have the three classics signs (at least from what I've read so far). I have the drooping shoulder, atrophied trapezius, and winging scapula. And a lot of pain. For me, however, the injury occurred from a fall rather then a surgical procedure. I have read that it can happen this way, a kind of whiplash effect perhaps, not quite sure. In the beginning I thought the pain was from my rotator cuff but the MRI didn't show any tear. When these other symptoms became noticeable I did research and SAN was what I found. I see my orthopedic surgeon on the 30th and I am going to ask what he thinks and have him send me for an EMG.
Thanks for letting me chime in, there is NO place else to talk about this.