This horse's sacrum acts as a sturdy platform for its huge pelvis. There is not a lot of room for movement within the sacroiliac (SI) joint itself. In fact, after the age of 10, the SI joints in most horses are fused. So the question is, if the SI joints are fused, how can one expect to restore normal joint function there?
You have to look at this a little differently than you would a person's SI joint. Think "muscle dysfunction" in this area, as opposed to joint dysfunction.
If your horse is showing hind end discomfort and stiffness, is unable to pick up or maintain canter leads, has poor low back muscle development, cannot engage or lacks impulsion, bucks or rears under saddle, the sacroiliac region may be to blame.
Bodywork and massage therapy can help relax and release the muscles around the joint to increase range of motion, relaxation, balance and enhance performance and well being.