The impression I had from what the surgeon said beforehand and what I read online
is that this is relatively minor surgery
and one can expect some pain associated with the surgery, but not limited range of motion. The day after his op he was taken for x-rays and put in a wheelchair, but as his legs were swung off the bed and bent 70 degrees he cried out in pain and almost fainted. It is now a week after surgery and his pain is still severe when bending his knees.