I'm having the hardest time picking "yes" or "no"
(hmmmm... maybe the PTSD/decision making skills are messing with me)
regardless, I'm gonna explain why I can't give a definiate answer.

Number #1, I am so new to this whole PTSD thing that I don't know enough about it to decide if it could prevent it for someone else.

For me?... I think if I would have gotten counselling immediately after the accident I would be ALOT further along in the healing process. But I don't think the PTSD could be avoided.
Unless they have some magic way to erase scars/memories/triggers...