My gelding (19 yo draft cross) fell on top of me three and a half years ago at a dead run. He tried really hard not to fall, and in the scramble, came down hard on his front left. My leg was crushed under him, but the soft-ish ground kept me from serious injury.
For me, my knee was badly bruised. Took almost a year for it to not be tender to the touch on the inside where the saddle caught me.
Even 6 months after the accident, my horse’s cannon bone still showed significant inflammation. (My vet actually thought it looked like bone cancer until we got a University to take a second look) They confirmed injury/inflammation.
He has been retired since the accident and only now is showing promising signs that he may recover enough for some light work.
My vet had me try stall rest for an extended period, but he just got more sore/stiff, so I opened his pen and gave him more room. I put him in with a buddy for a while, but it was too much for him, so he has been on his own in about a 1/2 acre paddock for some time. I learned that he does better with some movement, but there is definitely a line we cannot cross. I keep his feet trimmed regularly, toes are nice and short, and he is on SmartFlex (only thing that seems to help knock the edge off). We are finally at a place where he no longer noticeable limps, and I am going to start hand-walking him a few times a week to see how well he tolerates some extra movement. At best, I hope to get him/keep him sound enough to use in a kids-therapy program I work with.
Bone injuries can take a very long time to heal. Don’t rush it.