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Putting the Stride Back in a Pet's Step

FOR IMMEDIATE RELEASE
August 28, 2013

Total hip replacement—replacing the ball and socket of the hip joint with prosthetics—was performed on 332,000 people in the United States in 2010, according to the Centers for Disease Control and Prevention.

Pets, too, can benefit from this procedure, which will soon be offered again at the University of Illinois Veterinary Teaching Hospital in Urbana.

"Conditions in animals that can be treated with this surgery include arthritis, hip dysplasia (where the joint is malformed), or traumatic injury or fracture of the head of the femur, the leg bone that attaches to the joint," says Dr. Tisha Harper, a veterinarian who is board-certified in small animal surgery. Dr. Harper has completed training and is now certified to perform the surgery.

Dr. Harper uses what is known as a "press-fit" system for hip replacement. This system depends on an initial tight fit and then bony in-growth, over the long term, to provide stability to the joint. The press-fit system is a cementless system.

"Cemented implants can also be used," she explains, "but the press-fit approach eliminates complications associated with the use of bone cement such as thermal damage to the bone. The head of the femur and socket, called the acetabulum, fit together to hold the implants in place."

The choice of cemented versus cementless implants is often based on the shape of the bones and how secure the implant is during surgery.

While this procedure can be performed on both cats and dogs, Dr. Harper explains that it is mainly done for dogs.

"In the past, veterinary surgeons were able to perform total hip replacement surgery only on medium-sized and large dogs," she says. "Today a micro-hip system is available for small dogs and cats, although I most commonly see dogs."

To determine if an animal is a good candidate for a total hip replacement, the first step is to take x-rays. The animal's growth plates must be closed in order for it to be eligible for the surgery. Breeds mature at different rates, but in general the surgery can be performed as early as 12 to 14 months of age.

"The goal of a total hip replacement is to provide a pet with a pain free, functional, and biomechanically sound hip," says Dr. Harper. "Patients generally tend to do well following this procedure."

The total time of hospitalization, including the surgery, is two to three days. Patients should be totally recovered in about three months. Dr. Harper recommends taking x-rays three months after the procedure to check on the implants, and again once a year for a year or two after the surgery.

Improvement is usually immediate. "Even though there may be some discomfort after surgery, the patient generally starts using the limb within a few days," says Dr. Harper.

Post-operative care includes restricting the pet from running and jumping anywhere and from walking on slippery floors. According to Dr. Harper, the main complications of this surgery are dislocation of the hip prosthesis and infection. Because of this, she advises owners to walk their newly recovering pet with a leash and sling to prevent any splaying of the legs, which can cause dislocation of the hip. Pain medications and basic physical therapy are also part of the post-operative care.

Even if the pet needs both hips replaced, the procedure would be done one hip at a time to allow for the animal to properly recover from the surgeries.

"Since they are quadrupeds, animals are able to shift their weight and therefore some pets can do well with only one hip being replaced," says Dr. Harper.

For more information about a total hip replacement, speak with a veterinarian familiar with this specialized procedure.

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