Oh pish posh, speculate away! As long as any poster asking for advice understands it IS speculation.
And the same principles apply to a four-legged beast. My own horse has a permanent hitch in her right hind leg because of years of compensation for a left front shoulder injury. This, in turn, has led to long-standing issues with her sacrum. It is all related. I am not, necessarily saying that the back issue is not separate from the foot issue. Just that the possibilty that they are is entirely reasonable.
Vets do have to grope in the dark sometimes. Fixing the feet might help the back. If not, I recommend a competent chiropractor.
Get your pony to the Ovnicek trained trimmer, he should know how to deal with those bars and that sole. With as long as those bars are I would be surprised if the frog is even contacting the ground like it should. A good trim will help the frog be stimulated to better growth.
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