Legend - hyaluronic acid. The big training barn where I kept my Saddlebred while we fenced the place and built a barn had a lot of dressage horses and jumpers. They were all on 'maintenance' of some sort as if this was normal. Besides joint injections were also using the magical blankets with magnets, horse chiropractor adjustments, etc. and just kept riding them.
My horse had a club foot when I bought him. His heel was contracted, frog was set way up high in the foot with no frog pressure. He was intermittently stepping short on it. The trainer insisted he be kept shod. Tried rolled toe shoe, 'maintenance' shots, (not into the joint it was IM), nothing really worked.
Well, I got him home, pulled the shoes and let him free to graze on the damp soil of Oregon. I got a farrier that trims that hoof high/low like you are supposed to. The foot spread, got ground contact with his frog and he's been perfectly sound ever since. My shoer used to be a rodeo bull rider and has a front tooth missing.