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Legg–Calve–Perthes disease

 Legg–Calve–Perthes disease



Overview

Legg-Calve-Perthes (LEG-kahl-VAY-PER-tuz) disease is a childhood condition that occurs when blood supply to the ball part (femoral head) of the hip joint is temporarily interrupted and the bone begins to die.

This weakened bone gradually breaks apart and can lose its round shape. The body eventually restores blood supply to the ball, and the ball heals. But if the ball is no longer round after it heals, it can cause pain and stiffness. The complete process of bone death, fracture and renewal can take several years.

To keep the ball part of the joint as round as possible, doctors use a variety of treatments that keep it snug in the socket portion of the joint. The socket acts as a mold for the fragmented femoral head as it heals.

Symptoms

Symptoms of Perthes disease include:

Limping.

Pain or stiffness in the hip, groin, thigh or knee.

Limited range of motion of the hip joint.

Pain that worsens with activity and improves with rest.

Perthes disease usually involves just one hip. Both hips can be affected, but they usually are affected at different times.

Causes

Perthes disease occurs when too little blood reaches the ball portion of the hip joint for a short time. Without enough blood, this bone becomes weak and collapses. The cause of the reduced blood flow is unknown.

Risk factors

Risk factors for Perthes disease include:

Age. Perthes disease can affect children of nearly any age, but it most commonly begins between ages 4 and 10.

Your child's sex. Perthes is about four times more common in boys than in girls.

Complications

Children who have had Perthes disease are at higher risk of developing hip arthritis in adulthood — especially if the hip joint has poor healing. If the ball-and-socket joint doesn't fit together well after healing, the joint can wear out early.

In general, children who are diagnosed with Perthes disease after age 6 are more likely to develop hip conditions later in life. The younger the child is at the time of diagnosis, the better the chances for the hip joint to heal in a typical, round shape.

Diagnosis

During the physical exam, your healthcare professional might move your child's legs into various positions to check range of motion and see whether any of the positions cause pain.

Imaging tests

These types of tests, which are vital to the diagnosis of Perthes disease, might include:

X-rays. Initial X-rays may not show changes in the hip. It can take 1 to 2 months after symptoms begin for the changes related to Perthes disease to become clear on X-rays. Your healthcare professional will likely recommend several X-rays over time to track the progression of the disease.

MRI. This technology uses radio waves and a strong magnetic field to make very detailed images of bone and soft tissue inside the body. MRIs often can visualize bone damage caused by Perthes disease more clearly than X-rays can, but MRI isn't always needed.

Treatment

In Perthes disease, the complete healing process can take several years. The types of treatment recommended depend on the:

Age when symptoms began.

Stage of the disease.

Amount of hip damage.

As Perthes disease gets worse, the ball part of the joint, called the femoral head, weakens and breaks apart. During healing, the socket part of the joint can serve as a mold. This can help the weakened femoral head keep its round shape.

For this molding to work, the femoral head must sit snugly within the socket. Sometimes a child wears a special type of leg cast that spreads the legs widely apart for 4 to 6 weeks to keep the bone in the right position.

Some children need surgery to help keep the ball of the joint snug within the socket. This procedure might involve making wedge-shaped cuts in the thighbone or pelvis to align the joint again.

Surgery generally isn't needed for children younger than 6. In this age group, the hip socket is naturally more moldable, so the ball and socket usually continue to fit together well without surgery.

Other treatments

Some children, especially very young ones, might need only conservative treatments or observation. Conservative treatments can include:

Activity restrictions. Children with Perthes disease should not run, jump or take part in other high-impact activities that might speed up hip damage.

Crutches. Sometimes, your child may need to avoid bearing weight on the affected hip. Using crutches can help protect the joint.

Physical therapy. As the hip stiffens, the muscles and ligaments around it may shorten. Stretching exercises can help keep the hip more flexible.

Anti-inflammatory medicines. Your healthcare professional might recommend infants' or children's medicines that you can buy without a prescription, such as ibuprofen (Advil, Motrin, others) to help relieve your child's pain.

Type of Doctor Department : A pediatric orthopedic surgeon or specialist

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