I had spinal fusion on t11 t12 t13 t14 after eight monthes my doctor told me I was clear to do what ever I wanted. he said that my back was stronger than it was before. I had an accident at a local track that hurt my back. I was a little scared to ride for a while but its in my blood and I couldn't stay away. Now I ride harder than ever if you love riding enough you will ride again to.