There are many associations which help the disabled, and may be of help to you. I have pins in my femur, and it was put back a bit rotated, and is shorter than the other. I was on the back of a theraputic horse at 6 weeks (because I had to find out). I was not allowed to be fully weight bearing for 4 months, but I practiced in and out of an english saddle in our great room. The strength of the muscles as you recover I would say are the issue. Hips can pop out, spreading to ride might frighten your doc.
I kept at my docs, lots of pool therapy, and stretching on the bed etc.
I told doc, if I don't give it a reason to heal, (use it), it won't.
I am though in pain (my situation). After the last 2 years, I would slow down on the horses to relieve my own pain, but it's my life. It has been a lot of work. I would say, do it, and if you have to, you can get an extremely broke horse, and still take some short rides. You would not be the first.