Here is a great article about the causes of Equine bone breaks and tendon ruptures. Below are a few highlights, but click the link below for the full article..Hope you enjoy.
At a gallop, the equine front legs experience the equivalent of a car crashing down on it each time it hits the ground.
For every centimeter of toe length in an average Thoroughbred (subject of the study) the resulting force is 50 Kilograms of force acting on the tendons. That’s roughly 110 pounds of force per centimeter of toe length. For a visual, a centimeter is about the width of a pencil. What’s that mean – for every pencil width of tow growth your horse experiences more than 100 pounds of additional tendon force.