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Perthes’ disease, also known as Legg-Calvé-Perthes disease, is a rare childhood condition that affects the hip joint. It occurs when the blood supply to the head of the femur (the “ball” in the hip joint) is temporarily disrupted, leading to the deterioration of the bone tissue. This disease primarily affects children between the ages of 4 and 10, with boys being more commonly affected than girls.

Causes of Perthes’ Disease

The exact cause of Perthes’ disease remains unknown, but it is believed to be related to reduced blood flow to the femoral head. This lack of blood flow causes the bone tissue to weaken, making it more susceptible to damage and deformation. While genetics might play a role in some cases, there is no clear hereditary pattern associated with the disease. Other factors that could contribute to the development of Perthes’ disease include:

  1. Blood Supply Issues: A disruption in the blood supply to the femoral head can lead to decreased oxygen and nutrient delivery to the bone tissue, ultimately causing bone death (avascular necrosis).
  2. Environmental Factors: Certain environmental factors, such as smoking and exposure to secondhand smoke, might increase the risk of developing Perthes’ disease.
  3. Trauma: Trauma to the hip area is not a direct cause of Perthes’ disease, but it can worsen the condition if a child already has reduced blood flow to the hip joint.

Symptoms of Perthes’ Disease

The early symptoms of Perthes’ disease can be subtle and might include a limp or slight pain in the hip, thigh, or knee. As the disease progresses, more noticeable symptoms might appear:

  1. Pain: The child might experience increasing pain in the hip, groin, thigh, or knee area, especially during physical activity or after prolonged periods of inactivity.
  2. Limping: A characteristic limp might develop as the child tries to relieve the discomfort in the affected hip.
  3. Limited Range of Motion: Over time, the hip’s range of motion might become restricted due to the deterioration of the bone and surrounding tissues.
  4. Muscle Atrophy: Muscles around the hip joint can weaken and shrink due to the child’s reduced use of the affected leg.

Diagnosis and Treatment

A combination of physical examination, medical history assessment, and imaging tests like X-rays and MRI scans are used to diagnose Perthes’ disease. Early diagnosis is crucial for effective management. The treatment approach aims to alleviate pain, preserve hip joint function, and promote proper bone growth:

  1. Non-Surgical Treatment: Initially, the child might be advised to restrict certain activities and use crutches to minimize pressure on the affected hip. Physical therapy and exercises can help maintain flexibility and strength.
  2. Surgical Interventions: In severe cases, when non-surgical methods are ineffective, surgical interventions might be considered. Procedures like osteotomy (reshaping of the bone) or hip replacement might be recommended, particularly in older children or when the condition is diagnosed late.

Impact on Hip Joints

Perthes’ disease can have lasting effects on the hip joints, especially if left untreated or not managed properly. The deformity caused by the damaged bone can lead to issues such as:

  1. Osteoarthritis: The altered hip joint structure can increase the risk of developing osteoarthritis later in life.
  2. Leg Length Discrepancy: The affected leg might end up shorter than the other, leading to problems with gait and posture.
  3. Joint Stiffness: Reduced range of motion in the hip joint can result in stiffness and difficulty in performing daily activities.


Perthes’ disease is a complex condition that affects children’s hip joints due to disrupted blood supply and subsequent bone damage. While the exact cause remains uncertain, early diagnosis and appropriate treatment are essential to prevent long-term joint problems. Parents, caregivers, and healthcare professionals should be vigilant for any signs of Perthes’ disease to ensure timely intervention and a better quality of life for affected children.

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