Canine Hip Dysplasia (CHD) is the most common, inheritable orthopedic problem seen in dogs. It afflicts virtually all breeds of dogs but is especially problematic in large and giant breeds. Clinically, the disease manifests itself in one of two ways: 1) a severe form that typically afflicts the younger animal and is usually characterized by marked pain and lameness, or 2) a more chronic form with more gradual onset of clinical signs such as mild, intermittent pain, stiffness and restricted range of motion in the hips as the dog ages. In many cases, the chronic form may be clinically silent.

Dog owners and veterinarians have long sought a reliable method to accurately predict the likelihood of a dog developing CHD and passing that genetic trait to any offspring. It was generally recognized that the traditional diagnostic methods of hip evaluation were associated with disappointing progress in reducing the frequency of CHD. The PennHIP method was developed to address this problem.

PennHIP is a scientific method to evaluate a dog for Hip Dysplasia. In 1983, Dr. Gail Smith from the University of Pennsylvania School of Veterinary Medicine began to actively research and develop a new scientific method for the early diagnosis of Canine Hip Dysplasia. This research resulted in a diagnostic method capable of estimating the susceptibility for CHD in dogs as young as sixteen weeks. The method has shown distinct advantages over other diagnostic methods that recommend final evaluation be performed when the dog is two years of age or older.

The radiographic procedure involves a special positioning of the dog so that the dog's passive hip laxity can be accurately measured. In simple terms, passive hip laxity refers to the degree of "looseness" of the hip ball in the hip socket when the dog's muscles are completely relaxed. Research has shown that the degree of passive hip laxity is an important factor in determining susceptibility to developing Degenerative Joint Disease (DJD) later in life. Radiographic hip DJD, also known as osteoarthritis, is generally accepted as confirmation of CHD.

To obtain diagnostic radiographs, it is important that the patient and the surrounding hip musculature be completely relaxed. For the comfort and safety of the dog, this requires deep sedation, or based on our preference, general anesthesia. Typically, three separate radiographs are made during an evaluation.

The PennHIP method can be performed on dogs as young as sixteen weeks, compared with two years of age using the standard technique. An early estimate of a dog's hip integrity is invaluable, whether the dog's intended purpose will be for breeding, for working or as a family pet.

For the breeder, the information compiled in the PennHIP database permits informed selection of breeding stock based on hip tightness relative to other members of the same breed. Studies show that the selection process for tighter hips can be imposed without sacrificing other desirable traits.

For the pet owner, the ability to identify your pet's susceptibility to develop DJD will allow you and our staff to plan lifestyle adjustments to minimize disease expression if necessary.

For everyone, breeders and pet owners alike, the PennHIP method offers an accurate and early appraisal of passive hip laxity. We are certified PennHIP collaborators and would be happy to discuss the procedure with you.

As certified collaborators in this new study, we can evaluate the hips of your dog at the age of 4 months or older and predict, with high accuracy, the likelihood of hip dysplasia occurring in your dog. If you have a pure breed, we can also tell you how the hips of your dog compare to other dogs within that breed. After the study is completely evaluated, a confidential consultation is held with you and a detailed explanation is discussed.

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