A knee dislocation occurs when the bones that form your knee are out of place. The bones of your calf (the tibia and fibula) get moved compared to the bone of your thigh (femur). The bones of your knee are held together by strong bands of tissue, called ligaments. For a knee dislocation to happen, these bands have to tear.If the knee is dislocated, it will look deformed. The usual straight line of your leg will be crooked.
Specifically, there will be a large amount of pain in the knee. Sometimes, there will be no feeling below the knee. If the knee relocates, on it's own it will become swollen. You may not be able to feel a pulse (your heartbeat) in your foot.
Dislocation of the knee requires urgent treatment to avoid permanent damage to the nerves and blood vessels.
The doctor will try to manipulate the knee joint back into its correct position. This is done more easily soon after injury. If there has been a delay in getting medical attention, the doctor may give you anesthesia before moving your knee back in place because of pain and muscle spasms.
In some cases emergency surgery is necessary. The doctor will perform surgery under these conditions:
You have no pulse at the ankle.
The artery at the back of the knee joint is injured.
The bones cannot be moved back into correct position.
The skin is cut and the bone is exposed.