I recently purchased a 7 yr old Arabian gelding to turn into my endurance horse (I have experience in endurance). When I test rode him, he seemed fine, just a little nervous, but I figured he would eventually work out of that. About a month after I brought him home(and after I'd ridden him quite a few times) he freaked out on me during a ride. He started bucking, which normally I could handle, but also spinning. The spinning caught me off balance and I fell and ended up tearing my pcl in my knee. This meant no riding for 3-4 months! Since then I have had my friend ride him and he did the same thing and got her off. I'm thinking that his former owners would just spin him when he would buck, so now when he does buck, he spins on his own. I know the people typically use a one rein stop when a horse is bucking, but what do you do when the horse uses it against you?
I'm kind of at a loss as to what I should do. Before the accident, I had trailered him out to our local trails with a friend and he was an angel. He actually calmed down on the trail and felt relaxed, as opposed to in the arena where he's like a ticking time bomb. I work on ground work with him and lunge him. He is very well behaved then. I work on despooking exercises and he acts as if he could care less! I'm wondering if maybe he has just had bad experiences in the arena and strictly needs to be on the trail?
If anyone has any ideas it would be greatly appreciated! My knee is finally healing up and I'm going to start riding him again as soon as I regain some leg strength. I really don't want to give up on this horse! He has amazing conformation for endurance and I think he could really excel.
Below is a picture from our trail ride. As you can see he is no dainty Arabian!