this sounds familiar. back in the 90's i was in miami beach, walking on the sidewalk with my now ex, and some guy who was wasted apparently jumped the curb and hit me, tossing me several feet, i'm told. i don't remember any of it, though, just waking up in the hospital in screaming pain. the doctor hovering over me asked what the date was, and i looked down and saw i was wearing shorts, so i answered it was in the summer. it was in december. spent a week or so in intensive care, and a few weeks in the hospital with a broken neck, along with a bunch of other bones. spent a couple months in a halo, etc... the guy who hit me had a long record of being a cocaine dealer and a pimp. didn't have insurance. the cops let him go and then said they couldn't find him after that, but i don't know how hard they looked. it took a long time to heal from that one, but in the end, the only really obvious problem that remained is a shoulder that pops out of joint from time to time. i guess you could say i was 'lucky'. hope your son is, as well.