lameness is complicated
If your horse is lame, this link could be a great tool to help you understand things. If you contact me, I can give you ideas on where to start. It will be best to get both a veterinarian AND an experienced farrier involved. We work better as a team!!
(the button is under construction: please use the link or copy and paste the address into your browser.) https://www.merckvetmanual.com/resourcespages/pet-owners-overview