Anatomy of the knee in dogs
The anterior cruciate ligament plays a crucial role in the knee joint – it enables hinge-like movement of the joint and prevents the bony structures from sliding back and forth. Cruciate ligament rupture remains one of the most common orthopedic conditions in dogs, and its symptoms are often ambiguous.
A cruciate ligament rupture is a typical sports injury in humans. In our four-legged friends, the situation is somewhat different. Besides traumatic causes, in dogs it is usually a "degenerative process," meaning that the cruciate ligament shows signs of wear and tear over the years, becomes increasingly thin, and eventually ruptures. These changes to the ligament structure increase with age and the dog's weight (poor physical condition also has a negative impact).
The structure of the knee joints in dogs and humans is somewhat similar. In your dog, too, the knee is a hinge joint that connects the upper and lower leg bones, as well as the kneecap. Firstly, the cruciate ligaments in a dog prevent the knee from buckling. Secondly, they ensure that the underside of your furry friend's paw doesn't slide forward.
The cruciate ligament is one of the most important tendons of the knee.
Together with the collateral ligaments, the cruciate ligaments stabilize the knee joint. Each knee joint has a lateral and a medial cruciate ligament, which are actively involved in extending the leg. The cruciate ligaments get their name from the fact that the two ligaments cross each other in the middle of the knee joint. If one of the cruciate ligaments tears, the stability and mobility of the knee are severely restricted.
Key symptoms of a cruciate ligament rupture in dogs
In most cases, a cruciate ligament rupture in dogs manifests as an initial limp. The degree of lameness varies depending on the severity of the injury. With minor tears, your dog may limp slightly for a few days and then walk normally again. Such a pre-existing injury increases the risk of a sudden jerk if your dog moves spontaneously or abruptly.
Dogs also raise their hind leg and carry it in a bent position. Normally, they don't lift their paw: if anything, only the tip of the paw touches the ground.
Furthermore, they The following symptoms may indicate a cruciate ligament tear go to the dog:
Degenerative cruciate ligament rupture in dogs
The degenerative cruciate ligament tear In dogs, cruciate ligament damage develops gradually, so the injury is often not visible at first (it has hardly any symptoms). This is tricky, because an unstable knee joint that no longer functions optimally will severely restrict the dog's mobility sooner or later. Jumping and running quickly become almost impossible, and abrupt braking is painful. Once a cruciate ligament rupture has led to osteoarthritis, it is nearly impossible to encourage the dog to exercise.
Your dog alternates between running briskly and walking very slowly. The affected leg becomes thinner due to muscle atrophy. The cruciate ligament hurts with each subsequent tear (otherwise, dogs don't show pain with degenerative ruptures).
A partial tear of the anterior cruciate ligament occurs primarily in larger dogs and is characterized by different symptoms. Affected dogs exhibit a so-called Initial sluggishness, which can disappear completely after a few steps. Therefore, dog owners often don't attach too much importance to the problem and dismiss it as just a sprain. However, the fact is that both a torn and a partially torn ligament can lead to the development of osteoarthritis within a few months.
Traumatic cruciate ligament rupture in dogs
In the case of a traumatic cruciate ligament tear (can occur as a result of an accident – in this case, it is called a traumaIf your dog shows sudden, acute lameness and pain at the moment of the accident, exhibiting clear symptoms, and if your dog stretches its leg out to the side while sitting, and the knee joint is swollen, and the hairy area around the nose becomes hot (severe heat buildup) at the knee, then this is a cause for concern.
If the cruciate ligament in the hind leg suddenly tears, this changes GaitThe dog will limp noticeably to protect the painful joint. The joint – palpable at the top of the hind leg – may swell and become hot. Some dogs only yelp briefly when injured and then show no further symptoms. This is especially true if the ligament is only partially torn, but not completely ruptured. Sometimes, dogs with a cruciate ligament rupture will stretch the affected leg out to the side while sitting or carefully stand on their tiptoes.
Here are some typical gait patterns/symptoms in the video: