I posted this on HF and got some interesting responses:
This is strictly a conformational question at this point - I'm not at a point where I'm ready to start jumping and, when I do get to that point, i'll be working with a trainer. However, my horse is slightly buck-kneed and I've been told by some people that I shouldn't jump him because it wouldn't be good for him with those knees. Other people have told me it isn't an issue. What do you think?
Read more: http://www.horseforum.com/jumping/can-he-jump-148771/#ixzz2J3H5khkR