I Have A L5 Vertebrate Pushed In 6mm And Pinching

I have a l5 vertebrate pushed in 6mm and pinching nerves, I have been diagnosed with spondylithasis, the drs. had me do physical theropy and steroid shots, but no change a lot of pain still. went to a neurosurgeon and now I am in a back brace no surgery yet. I like to ride sport quad atv's which I own, my question is should I sell them or will I be able to ride again