I did a lot of reading into it when Bo's hock went, I (regrettably) went with steroids' but would absolutely consider it for a horse that couldn't have steroids'.
It sounds dramatic, and honestly it is at a microscopic level, its going to do the damage that would be done gently over many months in the field, in a few days, but that means the healing can start all the sooner and pain levels and time off can be managed.
The problem with bute, PRP and steroids' is that by reducing the swelling you actually slow down the fusion which is what you want to happen as it should result in a significant reduction in pain, this does the opposite.