Not sure if it went through last time I posted, so will try again to be sure :)
I have a 6 y/o TB/paint gelding. 3 years ago he came up dead lame out of the pasture, to the point where he was walking on 3 legs. We checked with multiple vets who couldn't find exactly where the injury was. Finally a chiropractor told us he suspected a stifle injury. Sure enough, when we had his stifle x-rayed, the ligament on the outside of the joint was really dark and fuzzy looking. We decide to keep trying to rehabilitate him, as that vet said it was about 50/50 that he could ever be ridden. He slowly began to recover and I started gradually working him in the round pen, building up his muscle, and eventually was able to ride him. I've been riding him more often for the last 2 years and he has never shown any signs of lameness or pain!
However, the only thing that concerns me is that he will sometimes lose his back end from underneath him. It feels like it happens on both sides, but I'm assuming it has to do with his left, where the injury was. The best way I can describe it is like when you are walking and your knee just gives out sometimes. It feels like it happens for no reason and it's not painful! He does not bob his head or favor the leg in any way. He is also solid at every gait, and this only happens at the walk. I only ride him for pleasure, mostly trail riding, and lunge him in our sand arena.
I would appreciate any input or thoughts you guys have! :)
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Edit: He is always in the pasture, and this only seems to happen (often) when I have ridden him a lot. Usually happens about once per ride, if longer than a couple hours. I rode him every day for about a week and by Saturday, it was happening so often that I got off and walked.