he equine stifle is similar, ana- T tomically and physiologically, to the human knee but a bit more complex and generally more stable. Both joints use cruciate and patella ligaments, along with other stabilizing structures, to connect the bony framework that make up the joint: the tibia, fibula, femur and patella (knee cap). Horses, however, have much bigger quadriceps, the large muscles above the knee that make up the thigh, and three patella ligaments compared to only one in humans. These extra ligaments factor into the unique biomechanics that allow the horse to “lock” his knee cap and achieve a deep resting state while standing up, which was an important evolutionary advantage for a prey animal.
Even so, the stifle is susceptible to arthritis, resulting from a slow process of…
