TesseracT
Go Ducks! Go Huskies!
It's not the research, it's the facilities. The horses have to be in full body slings (which cause massive pressure sores and can interfere with digestion) or suspended in water to support their weight (which is horrible for their skin) - for months. There just aren't many places that have the facilities or expertise for it, and it's ridiculously expensive. Plus, if they founder, there's nothing you can do about it. Stress alone can cause founder, and all this is a huge stress to the horse.
The implants simply can't take the weight if the horses over that span, they'll eventually snap.
Oh I'll find a way. Just you wait...