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Hello. I'm sorry to hear about the rabbit.
If there is paralysis to one of the legs, it's probably due to a spinal fracture or dislocation. This is the most common hind limb/ spinal injury in rabbits. They can kick so hard that they fracture or dislocate the spine. It's usually both rear legs that are affected, but sometimes just one leg.
The treatment is surgery- stabilize the spine with plates or screws. Another option is to just amputate the leg that is not working and make him a 3-legged rabbit. No matter what, I would consult with an exotics vet or an orthopedic surgeon. The availability will be few and far between in your area. The cost is also likely to run 2000-4000 depending on the procedure.
If the travel or cost is not an option, euthanasia is not at all the wrong decision. That is the decision that most people make with spinal injuries in rabbits.
I'm sorry you're in this situation, let me know if you have any other questions.