Anterior Cruciate Ligament tear or rupture is the most common orthopedic problem in dogs. It almost always leads to progressive osteoarthritis and is debilitating if left untreated. The underlying cause of a canine ACL tear is biomechanical stress caused by a downward sloping tibial plateau.
In dogs, the ACL almost always tears gradually over time due to this biomechanical stress. The anatomy and biomechanics of the human and canine knee (also known as the stifle joint) differ dramatically since humans have a relatively level tibial plateau.