That darned dog! Ranger has ruptured his cranial cruciate ligament, which is know in human terms as a ruptured ACL. This is a very common injury in dogs. But what is it exactly?
The knee is a fairly complicated joint. It consists of the femur above, the tibia below, the kneecap (patella) in front, and the bean-like fabellae behind. Chunks of cartilage called the medial and lateral menisci fit between the femur and tibia like cushions. An assortment of ligaments holds everything together, allowing the knee to bend the way it should and keep it from bending the way it shouldn’t.