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Dogs Hip Dysplasia


FACTSHEET

 

 

 
 

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What is hip dysplasia?

Hip dysplasia is defined as a deformity of the coxofemoral (hip) joint that occurs during the growth period. Hip dysplasia is a hereditary condition that creates a poorly fitting hip joint. As the dog walks on this joint, arthritis will eventually develop, causing pain in the joint. The degree of lameness that occurs is usually dependent upon the extent of arthritic changes in the hip joint.

 

Is this found in certain types of dogs?

Most larger dogs can be affected with hip dysplasia, although it is predominantly seen in larger purebred dogs, such as German Shepherds, St. Bernards, Labrador Retrievers, Pointers, Setters, Malamutes, and Rottweilers. There is equal distribution of the disease between male and female dogs.

 

What are the clinical signs, and when do they occur?

The typical clinical signs of hip dysplasia are rear leg pain, lack of coordination, and a reluctance to rise. Wasting of the large muscle groups in the rear limbs may eventually develop. Most guardians report that the dog has had difficulty in rising from a lying position for a period of weeks or months; lameness and pain subsequently develop.

 

Again, the severity of signs and progression of the disease usually correlate with the extent of arthritis in the joint. Clinical signs can occur as early as 4-6 weeks of age, but most dogs manifest the disease as a lameness around one to two years of age. Dogs with mild hip dysplasia and minimal arthritis may not become painful and lame until 6-10 years of age.

 

How is it diagnosed?

Tentative diagnosis of hip dysplasia is made on the basis of history, type, and clinical signs. A large dog that has been slow to rise for several months and now is lame is highly suspect for hip dysplasia; a dog which refuses to rise should also be considered a candidate.

 

Because the clinical signs may mimic other diseases, final diagnosis of hip dysplasia can only be made on the basis of specific radiographic (x-ray) findings. To obtain the proper radiographs, dogs must be carefully positioned on the radiographic table. This procedure requires the use of a short-acting anesthetic. The radiographs are evaluated for abnormal shape of the hip joint and for degenerative changes (arthritis).

 

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How is it treated?

The degree of clinical signs and arthritic changes in the joints determine the specific approach to therapy. Treatment of hip dysplasia may involve the use of drugs or surgery, or both. The options are as follows:

 

  Anti-inflammatory drugs:

Several drugs will give relief from pain. Aspirin or acetaminophen may work well in some dogs. Other steroidal (cortisone) and non-steroidal drugs including Rimadyl may also be used. Most have some side-effects and most require administration once or twice daily. Many dogs have severe stomach irritation to ibuprofen, so this drug is not recommended. Unfortunately, it is not possible to predict which dog will respond to which drug.

 

Therefore, a series of trials may be needed to find the most effective one for your dog. Extreme caution is advised when these drugs are given to dogs with a history of kidney disease or with marginal kidney function. Many of these drugs have an adverse effect on blood flow to the kidneys and can lead to kidney failure. This does not appear to be a concern if kidney function is normal. As alluded to above, dogs with a history of ulcers are also at risk for complications. Your veterinarian can determine the risk for your dog. Anti-inflammatory drug therapy is most often used in older dogs, in dogs that did not get good relief from surgery, or in dogs for which surgery is not feasible.

 

  Surgery:

There are four main procedures: pectineal myotomy (muscle cutting surgery), femoral head ostectomy (ball removal), triple osteotomy, and hip joint replacement. These are performed by an orthopedic surgeon at some veterinary hospitals.

 

Pectineal myotomy is a relatively minor procedure that involves cutting a small muscle that puts pressure on the hip joint. It results in no loss of leg function and gives good relief in some dogs. If both hips are abnormal, both hips may be operated at the same time. The dog recovers from surgery in one to two days. However, this procedure does not stabilize the hip joint or prevent progression of arthritic changes. Within a few months to several years, pain and lameness will return.

 

Femoral head ostectomy (FHO) is another choice. The hip joint is a ball and socket joint. FHO is the removal of the ball part of the joint. This gives excellent results in small dogs because a functional "false joint" forms. However, some large dogs may not form this "false joint" very well. This procedure is usually used in large dogs if arthritis is very severe, if the hip dislocates, or if the expense of the other procedures is prohibitive.

 

Triple osteotomy is a procedure in which the pelvis is cut in three places around the hip joint. The bone is rotated to create better alignment with the femoral head (the ball). It is reattached so that the joint functions in a more normal fashion without looseness and pain. This should only be performed in a dog with no arthritic changes in the joint. It is an expensive procedure.

 

Hip joint transplant (hip replacement) is possible, as is done in humans. A stainless steel ball and socket are attached to the pelvis and femur in place of the abnormal ones. It is another expensive procedure, but it may give many years of pain-free use of the hips. Although the intent is for the transplant to be permanent, the new joint may loosen after a period of time.

 

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Can anything be done to prevent hip dysplasia in puppies?

Research has shown that the cause of hip dysplasia is related to a combination of genetic and environmental factors. The disease is known to be an inherited condition and the genetics of hip dysplasia are extremely complicated.

 

In addition, environmental factors such as overfeeding and excessive exercise can predispose a dog (especially growing puppies) to developing hip dysplasia. Because the inheritance of the disease is so complicated, many questions remain regarding eradication of the disease.

 

Here are some practical suggestions:

Consider a feeding program to slow growth. There is a growing body of evidence indicating that dogs that grow very rapidly are more likely to have hip dysplasia. Many authorities recommend feeding an adult-type food to puppies at high risk so their growth is slower. They will still reach their full genetic body size, but just not as rapidly.

 

Avoid excessive exercise in a growing high-risk puppy. Any abnormality in the structure of the hip joint is magnified if excessive running and jumping occur. It is not necessary to treat your puppy as if it were handicapped, but long sessions of running or chasing thrown objects can be detrimental to joints.

 

There are numerous important reasons why breeding any dog is not a responsible path — for the good of all dogs. However, breeding dogs whose hips are not normal, and who are therefore likely to have offspring with hip dysplasia, is particularly irresponsible. Never breed a dog who has been diagnosed with hip dysplasia.

 

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