Monica, don't know if this is reply is too late to advise you but I had a neck dissection done at the same time as a partial glossectomy(about 50% of my tongue) and graft of a flap from my arm. On discharge from hospital after ater about 10 days I could barely raise my arm to the horizontal at the side. A couple of months later afer some advice from a physio on exercises, I have complete mobility back. I had 22 lymph node removed so they poked around in there quite a bit but obviously avoided any damage to the accessory nerve that controls the shoulder muscle. Can't help with statistics. Its now 6 months on and my scar has healed beautifully. Neck is still strange to touch and some patches of numbness which have receeded over the months and I am told should improve still further.