Nice animation, lilmiraclesfarm! Here's my chronic locker, who is finally free of the awful condition since surgery in March of last year. He was overweight in this early photo and the deep angle of his croup and pelvis fooled me for years into thinking he wasn't straight in the hindquarters.

What I didn't realize was that his discomfort caused him to contract his hindquarters and hunch up his lower back, making all the joints look steeper. Can you see how there's bands of muscle bulging vertically between the top two yellow lines in the photo below? Those shouldn't be like that.

Since his surgery he has relaxed all those contracted muscles and stands much, much straighter in the hind end. His pelvis is still very steep but it's more apparent now that the stifle is pretty straight. This photo was taken this spring- try to look past the angle of the clipped hair.

Can you see what I mean? His bodyworker pointed out that a lot of apparent "conformation" is actually
posture, and if certain muscles are being held abnormally tense they can pull the body out of its natural alignment and cause the horse's conformation to look different than it actually is. Fascinating! I'm seeing that at work in the yearling I have now as well. He looked HORRIBLY post-legged this week and I asked the body-worker if he really is post-legged and that's causing the locking, or is the locking causing him to stand in a way that makes his joints look bad? She believes tentatively that it's postural at this point since when he folds his legs to take a step his stifle looks quite deep indeed, whereas Kody's stifle stays shallow and incorrect through all stages of movement like the mare above. It's hard to describe what I mean, but it's like Kody's stifle is too high and too far back. The bones aren't as long as they should be and the angle ends up too straight so they can meet. The baby doesn't have that problem but stands funny because he feels awkward and worries he will lock.
I don't have any pictures of the youngster online but can try and post some shots of his hips and hind legs later.
Leia
Horses, like people, are never "finished." The work of self-improvement is never done.
Proud partner of Arrowstar's Dakota, Evergreen Miniature Horse Club's 2008 Preliminary Combined Driving and Western Country Pleasure Under Champion
RIP Oak Bay Turbocharged Edition, April 15, 2008 - March 17, 2013
Beloved Partner of Leia and Kody
Taken Too Soon
RIP Spyderman, January 12, 1977 - May 27, 2010
You are (still) missed