My two and a half year old arabian gelding has been diagnosed by a vet to have locking stifles. First it appeared on only one side, then didn't recur until I sent him to the trainer to start him under saddle, and the trainer noticed he had it on both sides the day he got him. The trainer is concerned about my horses soundness and is reluctant to go ahead with breaking him to saddle. This goes against what the vet said, which was that this can happen in young horses, and that slow steady work will build strength in the stifles, especially trotting uphill. I'm really concerned about this, and I would like to know from others who have encountered this problem, and whether it would be wise to go ahead and have him broken so I can excersise him, or whether breaking him in at this point would just put more strain on his stifles, or whether I should just spell him for 12 months so he can mature, then get him broken in then. Please help!!!