I think you should keep them together if Hami doesn’t show aggression. Rabbits are often great at helping each other recover from illnesses and injury. Rabbit company may make all the difference to a sick bunny.

Broken bones heal fine if they are plastered in place, so the broken endings are aligned as they should. The body makes new bone tissue all the time, and is excellent at mending bone. You plaster broken bones so they will stay in place and the body is free to mend them, first by adding soft connective tissue, then by adding calcium to the connective tissue to make the new bone strong. Then when the bone is strong, you take off the plaster. Then rehab training will have to ensue so he hopefully learns to walk/hop again.

What you primarily need to worry about is his tummy, I think: tummies tend to not work very well if the patient can’t move around. So you should give him some tummy massages every day, and keep his rear end clean since he won’t be adept at cleaning himself. Here’s a video on how to do a tummy massage, but you’ll of course have to adapt the method to your bun since he is in plaster. https://www.youtube.com/watch?v=JnuxGLa2reg

As you may know, there is a kind of poop that the bunny should eat, called cecals, and they come out in little shiny clusters much like small clusters of grapes. You often never see them in a healthy bunny because they should be eaten as soon as they emerge from the butt, and this often happens at night. A bunny can’t survive for long without eating those cecals, so if you see those, you should actually try and serve them to the bunny as food. It’s very important.

Other than that, it’s good that he eats a lot, he needs lots of food now to heal, but his tummy needs fibers so you should try to get him to eat stuff that has lots of fibers. He should be kept warm but not hot and you can gently massage his whole un-plastered body a little if you like, because that helps his circulation and healing. If you’re lucky, Hami will groom him and that would be just so great.

Please keep us updated. We have members who have had bunnies with broken bones. This is a demanding task you’ve taken on, and we are happy to try and help you out.