My husband Dave broke C4-C6 in Oct 08 fall from tree. The doctor said he had damage on the cord to C3 area and he is complete.He has not recovered any other sensation since then. His feeling is above the nipple line and he can shrug, more on one side. He was off a vent for a few months, but got pneumonia over the summer and now uses it at night or if he needs a rest during the day.We have oxygen on hand if needed. He has a hard time getting a good cough.
From our short time since this happened we have seen that no two people are the same, so I can only tell you what our experience has been.
There is a lot of information on this site. I wishwei had known about it sooner.
Good luck!