Hip Joint Disease in Young Dogs in Dogs (Legg-Calvé-Perthes Disease)
- Occurrence: rarer
- Location of disease: Legs
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Legg-Calvé-Perthes disease, also known as femoral head necrosis, is an orthopedic condition in dogs caused by insufficient blood supply to the femoral head, leading to breakdown of bone tissue and ultimately deformation of the femoral head.
The most important facts at a glance
Legg-Calvé-Perthes disease in dogs is a condition in which blood supply to the femoral head is disrupted, leading to aseptic necrosis. This disease occurs mainly in young dogs between 4 and 12 months of age, particularly in small breeds such as Yorkshire Terriers and Miniature Poodles. The exact cause is unclear, but genetic factors appear to play a role. Traumas or mechanical stress can also trigger the disease by impairing blood supply to the hip. Symptoms include lameness, pain during movement, reluctance to move, and muscle atrophy. Diagnosis is made through clinical examination and X-rays, which show changes in the femoral head. Early diagnosis is crucial to slow disease progression and improve treatment success. Treatment varies depending on severity and can range from conservative therapy with pain medication and physiotherapy to surgical interventions. A common surgery is femoral head resection, in which the damaged femoral head is removed. After surgery, careful follow-up care is important to support recovery. The prognosis is generally good with timely treatment, and many dogs can lead a normal life. Prevention is difficult, but maintaining a healthy weight and choosing healthy parent animals can help reduce the risk.
Causes
The scientific basis of Legg-Calvé-Perthes disease involves disruption of blood supply to the femoral head, leading to aseptic necrosis. This condition typically occurs in young dogs between 4 and 12 months of age, particularly in small breeds such as Yorkshire Terriers, West Highland White Terriers, and Miniature Poodles. The reduction in blood supply causes bone tissue in the femoral head to die, leading to weakening and progressive deformation of the bone.
The exact causes of Legg-Calvé-Perthes disease are not fully understood, but genetic factors are believed to play a role. Studies have shown that the condition occurs more frequently in certain dog breeds, suggesting a hereditary component. Additionally, traumas or mechanical stress on the hip could contribute to the development of the disease by further impairing blood supply.
Another possible factor is bone development and growth. Since this disease often occurs in rapidly growing dogs, an imbalance in bone growth and blood supply during the developmental phase could play a role. Environmental factors and nutrition could also influence the occurrence and progression of the disease.
Symptoms
The symptoms of Legg-Calvé-Perthes disease are often subtle and develop gradually. One of the first signs is mild lameness of the affected leg, which initially occurs only occasionally but becomes more frequent over time. This can be caused by pain resulting from necrosis of the femoral head and subsequent inflammation.
Affected dogs may also show decreased activity and be less willing to run or jump. In advanced stages of the disease, lameness may become more pronounced, and the dog may have difficulty bearing weight on the affected leg. Examination may also reveal atrophy of the thigh muscles, as the dog favors the affected leg.
Additionally, restricted hip joint mobility may be noticed, and the dog may show pain when the joint is moved. In some cases, cracking or clicking may be heard when the hip joint is moved. These symptoms often indicate that the femoral head is already significantly damaged.
Diagnosis
Diagnosis of Legg-Calvé-Perthes disease is typically made through a combination of clinical examination and imaging procedures. The veterinarian begins with a thorough physical examination, assessing the dog’s gait, hip mobility, and possible pain responses.
X-rays are the most important diagnostic tool for confirming the condition. They typically show changes in the femoral head, such as bone loss, deformities, and in advanced cases, complete collapse of the femoral head. In some cases, additional imaging procedures such as MRI may be necessary to assess the extent of damage more accurately.
Early diagnosis is crucial for treatment success, as the disease is progressive and damage to the femoral head increases over time. An accurate diagnosis enables the veterinarian to develop the appropriate treatment strategy and determine the best timing for possible surgical intervention.
Therapy
Treatment of Legg-Calvé-Perthes disease depends on the severity of the condition and the age of the affected dog. In mild cases, conservative treatment with pain medication, anti-inflammatory drugs, and physiotherapy may be attempted to relieve symptoms and improve hip mobility.
In many cases, however, surgical intervention is necessary to relieve pain and improve hip joint function. The most common surgery is femoral head resection, in which the affected femoral head is removed. This prevents the damaged bone surfaces from rubbing against each other and causing pain. After surgery, a fibrous pseudojoint forms that allows hip mobility.
Post-operative care is crucial for treatment success. It typically includes physiotherapy and controlled exercise to strengthen muscles and promote joint mobility. The dog may need to be kept on a leash for several weeks to avoid excessive stress on the hip.
Prognosis and follow-up care
The prognosis for dogs with Legg-Calvé-Perthes disease varies depending on the severity of the condition and the treatment performed. With early diagnosis and appropriate treatment, especially surgical intervention, the prognosis is generally good. Many dogs can lead a pain-free life after surgery and resume normal activity.
In cases where the condition is not treated in time or no surgery is performed, permanent mobility impairment and chronic pain may occur. The dog’s quality of life can be significantly impaired, and there is a risk of secondary arthritis developing in the affected joint.
Long-term follow-up care and regular veterinary checkups are important to monitor recovery progress and detect potential complications early. Even after successful treatment, pet owners should ensure their dog maintains a healthy weight and avoid excessive stress on the hip.
Prevention
Since the exact causes of Legg-Calvé-Perthes disease are not fully known and genetic factors play a role, prevention of this condition is challenging. One of the best preventive measures is to pay attention to the health of the parent animals when selecting a puppy and choose breeders who test for genetic diseases.
It is important that dogs, especially those of breeds prone to the condition, maintain a healthy weight to minimize stress on the hip joints. A balanced diet and regular but not excessive exercise can help maintain joint health.
Although there are no specific measures to completely prevent the disease, early preventive examinations by a veterinarian can help detect early signs of the disease and intervene promptly. Careful attention to the dog’s musculoskeletal system, combined with good veterinary care, can reduce the risk of complications and slow disease progression.