Movement is controlled by ligaments and tendons which are made of very tough tissue that attaches to the bones. The knee joint is particularly susceptible to damage from strained or torn ligaments. Over-extension of the knee joint may tear this ligament allowing the two bones to slide back and forth causing pain, lameness, and instability. Excessive movement over a period of time leads to arthritis and pain.
Overweight dogs are most susceptible due to the excess pressure created on the joints.
Conservative medical therapy initially using anti-inflammatory drugs may allow healing if the ligaments are merely stretched instead of being torn. Depending on the severity of the rupture, treatment may consist of rest and medication or surgical repair of the torn ligament. Your doctor will advise you concerning the treatment necessary for your pet. Removal of the damaged cartilage. Replacement of the torn ligament.