I'm sorry to hear about your accident as a baby.
But your experience did bring up an interesting point.
I've always wondered if it was a good idea to bring up past medical issues as a reason for going into a medical field. I've always thought that if you aren't lying, then it seems like a perfectly valid reason. It is an experience that has affected you and that you now show an academic interest in.
However, all I keep hearing from residency directors is that they absolutely hate it when kids tell them, "I've worn glasses since I was 5 and that is why I want to go into ophtho" or "I have psoriasis and that is why I want to enter derm"
My question is then, how do you answer this question: "Why do you want to enter [insert field here]?"