umfortunately, you need to look at this horse's quality of life. If she is going to be in pain 24/7 and no treatment has helped, putting her down is the best thing you can do for her. If you really love her, its sometimes the best thing to do. It sucks being an animal lover/owner for this exact reason.
On a side note, I have a dog diagnosed with ocd in his back left hock. He's on antiinflammatory/pain reliever, gluclosamine/chondriotin/msm supplement in high doses, and his activity level had to be diminished. We have to be careful about how much 'outside' time he gets because he will literally go all day. He walks fine on great days, limps on his decent days, and on bad days he wont even put weight on the leg at all.
Surgery was quoted between 2000-4500 at msu vet college. Which is just too much to to spend without knowing for sure if he will be back to 100 percent.
Good luck with your horse and your decisions.
Any future horse you purchase, do a pre purchase exam. I learned the hard way unfortunately. Sounds like you may have as well with this poor girl. Poor rosie.
If she were my horse, id put her down and end her pain forever.
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