Stifle locking after standing still?
I have some questions and was wondering whether anyone else here has experienced something similar with their horse. I'll try to explain the situation as best I can ... Sorry if it gets a little long!
I have an 8 year old Appendix gelding whom I have noticed, on occasion, experiences locking of the stifle. However, I have NEVER seen or felt him do it while moving forward ... It only seems to occur after he has been standing still for several minutes, such as in the cross ties or wash stall. Usually it occur when you ask him to pick up a hind leg to pick out the hoof or check the shoe ... His stifle locks, then releases suddenly causing him to jerk his leg upward with an audible "pop". It seems to happen more frequently with his left hind than the right, although I have also noticed it on the right hind on rare occasions.
It also sometimes happens when you ask him to back up, but once again it always seems to be after he has been standing still for a period of time, and usually after having his feet picked up. However, when it occurs he is able to step forward normally, although if you ask him to step back again it frequently recurs. I have never noticed it while backing him under saddle, though.
I have never felt him lock or catch while riding ... As I said it is always when he has been standing, and usually after he has had to stand on 3 legs while having his feet handled. He is turned out every day, in a large pasture on a hillside, and is currently in moderate work, although he is getting more arena riding and less hill work this time of year due to the weather.
Has anyone else experienced anything like this? Is it something that is likely to affect his soundness and safety, or is it something that really isn't much of a concern since it doesn't seem to affect him as long as he's moving forward? He has spent most of his life up to this point being ridden Western but I am hoping to use him for lower level eventing.
And yes, I already plan to discuss it with my vet :)