Not exactly the same location, but Keebler had a slab fracture of the front of the third tarsal bone. We don’t know exactly how it happened, but the usual mechanism is forced hyperextension, like getting a hind leg stuck in mud and yanking it up. He came in one day hopping lame, with what looked like a rope burn on his gaskin, so we speculate he may have rolled close to the electric fence and zapped himself then struggled up awkwardly, or he put a hind leg down in one spot near our little creek where there is some mud and yanked it.
In any case, it was a slab, about the size of your pinky fingernail, and was non-displaced. He was really lame sometimes and not lame at all at other times. this was actually a tough diagnosis to make. He healed up really nicely with just 4 months of stall rest, and although there is a slight “bump” that remains on the x-rays, it does not involve the articulating surface of the hock joints themselves and it doesn’t bother him at all any more. No shockwave–vets thought (correctly) it would heal just fine on its own.
Again, not sure if it’s even remotely relevant to your case but I hope your outcome is the same: good! 