I admit that I am making this thread a little early as I don't have a lot of information at this point yet. However, I want to know the subtle differences between how a horse may move if they have a stifle injury vs a SI problem. I'm really not much good at spotting lameness unless it is severe. So I guess my question is... will there be a noticeable difference in how the horse moves depending on if the stifle is injured or the SI area is injured? Is that too difficult of a question to answer without more information? I'm asking because I've been suspecting some issues with Sublime for the majority of this show season now. Initially we thought it was his hocks. But I'm wondering if it isn't higher up. At a show this weekend I had a couple trainers look at him while I rode and they both said they believe he has some type of issue with his right hind leg. The one trainer said he believed it could be related to his stifle by the way he was moving. They're obviously not vets, so I am going to get a vet to look at him again. Sublime had started swishing his tail more and more at the canter throughout this summer and initially I thought it was related to his hocks and perhaps how I was riding him. But then at one point he even had a bunny hop type canter. That hasn't happened again, but at this show this weekend he would not stop swishing his tail at all unless we were walking. He has never swished his tail in the trot until this weekend, so I figure the problem has not been solved. Anyway. I have a video from our class this weekend that I can post later on today if anyone is interested in seeing it to see if they also see a stifle problem, or something else. It almost looks like he is hesitant to step underneath himself with his right hind, especially at the canter. Until then-any info about stifle or SI injuries is much appreciated.