I have had Paradise for about a month now and I have been riding him for just over 2 weeks. I noticed a popping sound coming from his left stifle(or possibly hock, im not totally sure). He didn't seem to feel any discomfort and was feeling ready to run so I just ignored it and figured he was just stiff from not being worked in so long. Well, when it persisted through the next few rides, we called the previous owner to see what it might be, as we knew that there was an issure one of his hind legs the prohibited him from racing(well, without being loaded up with drugs anyway, and he wasn't winning, so they ended his racing career). Turns out, he has OCD, or Osteochondritis Dissicans. Apperently, what that means is, there is a bone chip, along with a peice of cartilage conering it, that came loose from a join and is floating around near the bone. So this keeps him from doing high impact sports such as racing and, unfortuanatly, jumping. I suppose we could drug him up so I could jump him(he's huge and athletic, he'd be a good jumper), but my horses wefare comes first so, no jumping for us :(. It's disapointing, but its ok. Anyway, I was just wondering if anyone else on here has experience with OCD and could tell me a little more about our situation. My dad talked to our vet(who, ironicly, was Paradise's previous vet) and he said just no showing or high impact sports. W/T/C, trails, all that he is still sound to do though. So, share your ecperiences with this(I guess anywhere from 5-25 percent of the horse population has it) and what happened to the horse(s) affected.