It really does depend. I’ve done this twice myself, once while boarding, once at home The rehab didn’t require special skills or equipment
Every rehab goes better with body work of some kind, at some point. Injuries create compensations. So for that, it’s about which to use, at what point. Non-injured body parts can have massage work done right away. Some chiro work too but I’d put the money into massage first. Injured areas need to be past the acute phase for most therapies
Bone injuries could probably heal faster if swimming or a water treadmill was used in the beginning of active rehab Soft tissue injuries, which my guy’s both were, benefit from firmer footing in the beginning.
A lot depends on the turnout situation, and the temperament of the horse.
Most rehab isn’t complicated. It’s a progression of slower work to longer work to adding gaits to adding different footing to adding time.
It’s usually about whether the owner has the time - maybe they need to be hand walked 2-3 times a day and the owner works f/t 45 minutes from the barn, or whether the owner can physically handle the horse - maybe the horse needs better living through chemistry to get through the initial work after the layup
You just have to look at the situation in front of you. You might even decide it’s best to send the horse somewhere else for the actual layup - maybe he’s going nuts in your quiet 3-horse back yard barn, but would be very happy in a very busy larger barn while stuck in a stall.