From: Equestrian and Horse | Horse Ailments
Ringbone
This is a bony growth the occurs on either the long or short pastern.
When Does Ringbone Happen?
When a bone or joint is put under uneven stresses or wear the joint compensates by producing more bone in that area to help to stabilize the area. With ringbone this can be problematic if it interferes with the joint itself as it will limit the movement of the joint.
Causes