Tom,
When I was 17 I had a really "Big off", 5 weeks in hospital, various operations and 6 months before I could walk properly again.
As soon as I could bend my legs I was back pillion on a bike. As it turned out this was not the sensible approach as a subsequent accident left me with a bent pin in my leg and the need for a further operation - hey ho.
Any kind of accident makes you stop and think. Why wouldn't it....
Get back in the saddle, see how it feels, take it easy and judge for yourself.
At the end of the day, you and only you will know if it's the right thing to do.
Good luck mate.
Nick
I have no political interests or opinions, so don't ask....