I have been told that my dog has hip dysplasia but she isn't lame. Can the diagnosis be correct?
Hip dysplasia is a deformity of the hip that occurs during growth. The hip joint is a "ball and socket" joint. During growth both the "ball" (the head of the femur or thighbone) and the "socket" in the pelvis (acetabulum) must grow at equal rates.
In hip dysplasia this uniform growth does not occur. The result is laxity of the joint followed by degenerative joint disease (DJD) or osteoarthritis (OA), which is the body's attempt to stabilize the loose hip joint.
The degree of lameness that occurs is dependent on the extent of these arthritic changes and may not be correlated with the appearance of the hip joint on x-rays. Some pets with significant signs of hip dysplasia or osteoarthritis on x-rays may not exhibit any clinical signs while others with minimal changes may experience severe pain and lameness.
What causes it?
There are two primary causes of hip dysplasia, genetics and diet. The genes involved have not been conclusively identified, but it is believed to involve more than one gene. Advances in nutritional research have shown that diet plays an important role in the development of hip dysplasia. Large breed (generally greater than 50 lbs.) puppies should be fed a special large breed growth diet during the first year of life to reduce this risk.
If it is hereditary, are certain breeds affected more than others?
Yes, although any dog can be affected, it is predominantly seen in larger dogs such as German shepherds, Saint Bernards, Labrador retrievers, golden retrievers, Old English sheepdogs, Bulldogs, etc. Large mixed-breed dogs are also at risk for developing hip dysplasia and should be fed a special large breed growth diet the first year.
What symptoms should I look for?
Weakness and pain in the hindlegs are the usual clinical signs. The dog appears wobbly and is reluctant to rise from a sitting or lying position. This can be seen in puppies a few months old but is most common in dogs one to two years of age. Dogs with mild hip dysplasia on x-ray may develop minimal arthritis without clinical signs until they are older.
How is it diagnosed?
A hip radiograph under general anesthetic is the preferred method for diagnosing hip dysplasia. Clinical signs and palpable joint laxity may also indicate hip dysplasia. Any pet suspected of having hip dysplasia should be radiographed as soon as possible.
What is the treatment?
This depends upon the pet's clinical signs and amount of discomfort. There are very effective non-steroidal anti-inflammatory drugs (NSAIDs) that have minimal side effects. The choice of medication is made on an individual basis and various drugs may need to be tried before finding the most effective one. Most dogs with hip dysplasia should receive veterinary-approved glucosamine, chondroitin sulfate and/or omega-3 fatty acid nutritional supplements. Moderate daily exercise, avoiding high impact activities such as jumping, may help keep the patient mobile. Since excess weight puts undue stress on the hip joints, weight loss is strongly recommended in overweight dogs.
What if NSAIDs don't help?
The alternative to NSAID therapy is surgery. There are several surgical procedures available to treat hip dysplasia. The two most common surgical techniques for hip dysplasia are total hip replacement and femoral head ostectomy (FHO). The choice of surgery will be determined by your pet's condition and lifestyle.
I originally intended to breed my dog. What should I do?
Hip dysplasia is considered a genetic or inherited disease. We do not recommend that any pet showing any signs of hip dysplasia be bred.
What else can I do to reduce the risk of hip dysplasia?
Large breed or at-risk puppies should eat a special large-breed growth diet during their first year of life.
"Calcium levels are extremely important, and puppies that are on a commercial diet should NEVER receive additional calcium supplementation."
Calcium levels are extremely important, and puppies that are on a commercial diet should NEVER receive additional calcium supplementation. At-risk puppies should be given controlled exercise and should not be encouraged to play high-impact games such as frisbee while they are growing rapidly. Your veterinarian will give you specific feeding and exercise guidelines to ensure that you are providing the best care for your dog.
Is there anything else I ought to know?
If you decide to purchase a large breed puppy, make sure that the parents are certified clear of hip dysplasia. Dogs can be certified by the Orthopedic Foundation for Animals (OFA). If both parents of the large breed puppy you are interested in aren't OFA-certified, you should choose another dog.
For more information on selecting a large breed puppy or hip dysplasia, contact your veterinarian.