My riding partner had a laminectomy and fusion in her neck and still rides though not quite at her former level; and I have returned to riding after a couple of devastating injuries. The most recent one, I shattered my right ankle, and had a non union fracture that required two bone grafts and an electrode connected to a battery stimulator to finally get it to heal.
BUT I'm not a medical professional, and I don't know what the specific risks are with your injury.
What I can tell you is that *lots* of folks, and plenty on this forum, recover from signifigant injuries and continue riding. In your shoes, I would find a sports medicine doctor - having worked with other athletes, they tend to be more understanding about the desire to return to riding, and better at analyzing exactly what's required.
Then find, a sweet, safe horse and a good instructor who's familiar with rider rehab and take it slow.
Oh, and post here for encouragement and moral support.