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Irritable hip is a common childhood condition that causes symptoms such as hip pain and limping.
Doctors sometimes refer to irritable hip as transient or toxic synovitis.
Hip pain isn't usually severe, but your child may be reluctant to place weight on the affected leg.
Occasionally, an irritable hip may also cause:
In younger children who are unable to speak, the only noticeable symptom may be crying at night.
Although irritable hip is usually a mild condition, you should take your child to see your GP if you are concerned about their hips, so that a diagnosis can be confirmed.
This is because irritable hip shares symptoms of more serious hip conditions, such as septic arthritis (an infection inside the hip) or Perthes disease.
Your GP will examine their hip and may recommend further tests to rule out other causes. These tests include:
If there's fluid on the joint, a sample can be removed and checked for an infection. Just removing the fluid from the joint can ease the symptoms.
The condition develops when the lining that covers the hip joint (the synovial membrane) becomes irritated and inflamed, although the cause of inflammation is unclear.
Some cases of irritable hip occur following a viral infection in the chest, throat or digestive system. Many experts think the synovial membrane in the hip becomes inflamed as a complication of the infection. However, there is no hard evidence to support this theory.
Another theory is that a hip injury may cause the swelling, although many cases develop in children who do not have a history of injury.
Irritable hip can affect boys and girls of any age, but is most common between the age of four and 10 years old. The condition affects twice as many boys than girls.
As a parent, it can be very worrying if your child is diagnosed with irritable hip and is struggling to walk. However, the condition is usually short-lived.
Most cases don't require specific treatment, because the pain usually passes within two weeks.
A small number of children with irritable hip go on to have further episodes. However, these episodes usually become less frequent and eventually stop when the child is older.
Ibuprofen, which is available over the counter, can be used to relieve pain and reduce inflammation. Your child should also rest the affected leg until symptoms have passed.
Massaging the affected hip and applying heat may also help to reduce your child's hip pain.
It usually takes a couple of weeks to recover from irritable hip, although your GP may recommend that your child does not play sport or take part in any strenuous activities for at least another two weeks following treatment. This is to reduce the chances of irritable hip returning.
Swimming is a good way to strengthen the joint and get it moving again.
A follow-up appointment may be needed up to six months later. This is to rule out other hip conditions that can also cause pain, stiffness and a limp.