Who injected the front feet? Why do you do it? What do you inject with?
Do you go straight to injecting or fix the shoeing first?
I injected multiple times while doing corrective shoeing. No vet nor farrier nor shoe would work long term. I went barefoot and he's finally been sound for over a year! You can read info here:
Proper shoeing can fix the problem a lot of the time. If the foot is trimmed evenly and is balanced, then the coffin bone is level, thus reducing inflammation/soreness. Sometimes though regular wear and tear causes slight "remodeling" of the coffin bone and injections are necessary. My horse gets his coffin joints injected about every 6 months with a steroid/HA injection like you would use for hocks or another joint. I would definitely recommend making sure your farrier is not causing more harm than good first and then look into injections. Also, get x-rays taken and see if the coffin bone is level or not and go from there :)
My gelding was running off times (like not even placing in 4d) and went to the vet he was lame on his front right. Blocked the hoof and he trotted off sound. Took rads and the ONLY thing the vet could find was uneven coffin joint spacing so she suggested we do a little with shoeing first, still lame (.5 better on lameness scare she said) so we injected with HA and steroid for the inflamation. Put him on Pentosan/Glucosamine and he is back to running 1D/2D times.
I have done coffin joint injections on several different horses to help with front foot pain. The typical routine for us when a horse starts showing front foot pain is to get to our lameness vet for a diagnosis. He will flex test, block, x-ray and then make a suggestion. He will recommend shoeing changes based on what he sees on the outside as well as what he sees on the x-rays. At this point we usually inject the coffin joint. Then our farrier will make the recommended changes. If we see positive results we will stop there. If we don't see the changes we are looking for we will go back and have the navicular bursa injected as well.
My personal opinion is that if there is pain and inflammation I want to inject to get that managed, and then the shoeing changes should help in the long-term.