Transient Synovitis of the Hip
- Adolescent Osteochondritis Dissecans
- Back Pain in Children
- Bowlegs in Children
- Flatfeet (Pes Planus)
- Developmental Dysplasia of the Hip (DDH)
- Jumper’s Knee
- Limping in Children
- Nursemaid’s Elbow (Pulled Elbow)
- Osgood Schlatter Disease
- Panner’s Disease
- Perthes Disease
- Rotational Deformities in Children
- Septic Arthritis of the Hip
- Sever’s Syndrome
- Slipped Capital Femoral Epiphysis (SCFE)
- Tarsal Coalition
- Transient Synovitis of the Hip
Transient Synovitis Children Specialist
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Transient synovitis of the hip is an acute inflammatory condition of the inner lining of the hip. Transient means it is temporary and doesn’t last long. Transient synovitis is also known as toxic synovitis or irritable hip.
This condition affects young children (boys more than girls) most often. In fact, it’s the most common cause of acute hip pain in young children between the ages of three and 10. However, there are reports of transient synovitis in children less than one year old and in adults.
What parts of the hip are affected?
Articular cartilage is the material that covers the ends of the bones of any joint. Articular cartilage is about one-quarter of an inch thick in the large, weight-bearing joints like the hip. In the hip, articular cartilage covers the end of the femur and the socket portion of the acetabulum in the pelvis. The cartilage is especially thick in the back part of the socket, as this is where most of the force occurs during walking and running.
Articular cartilage is white and shiny and has a rubbery consistency. It is slippery, which allows the joint surfaces to slide against one another without causing any damage. The function of articular cartilage is to absorb shock and provide an extremely smooth surface to make motion easier. We have articular cartilage essentially everywhere that two bony surfaces move against one another, or articulate.
Causes of Transient Synovitis of the Hip
What causes this condition?
The exact cause of this problem is unknown. In some cases, it may develop after a recent viral infection (such as a cold or upper respiratory infection). In a smaller number of children, trauma to the hip is followed by transient synovitis.
There is much debate about a possible link between transient synovitis and another condition called Legg-Calve-Perthes disease. In Perthes disease, the blood supply to the growth center of the hip (the capital femoral epiphysis) is disturbed, causing the bone in this area to die. The blood supply eventually returns, and the bone heals.
Symptoms of Transient Synovitis of the Hip
What are the symptoms?
Inflammation and effusion (swelling) can cause sudden hip pain. Usually only one hip is involved. The child may refuse to walk or may limp when walking as the first sign of a problem. Younger children who aren’t walking yet stop crawling or change the way they get around. They may cry at night or when having the diaper changed.
Your child may have a slight fever. A high fever is usually a sign of something more serious such as septic arthritis (bacterial infection of the hip) or osteomyelitis (bone infection).
In all age groups, there is usually a loss of hip motion. The child doesn’t want to put weight on that leg. The painful symptoms may travel to the thigh, groin, or knee on the same side. Sometimes there isn’t hip pain but just groin, thigh, or knee pain.
Your child may want to keep the hip and leg in a resting position of flexion (bent), external rotation (turned outward), and abduction (away from the other leg). This position opens up the joint capsule helps reduce the pain by taking pressure off the soft tissue structures.
Diagnosis of Transient Synovitis of the Hip
How do doctors diagnose this condition?
The history and physical examination are probably the most important tools the physician uses to diagnose transient synovitis of the hip. Motion is usually limited and painful. The hip is tender to palpation.
X-rays are usually taken. Though radiographs don’t show synovitis, they do help the physician rule out a fracture, tumor, or slipped capital femoral epiphysis (slippage of the growth plate). More advanced imaging such as MRI or bone scan may be needed if there is a need to rule out other more serious problems.
A blood test will show mild inflammation. If needed, the physician may order an ultrasound of the hip. This test will show any effusion (fluid collection) in the hip joint. Drawing the fluid out with a needle called needle aspiration will show if there is pus in the joint from septic (bacterial) arthritis. The fluid is clear in transient synovitis.
Treatment of Transient Synovitis of the Hip
What treatment options are available?
Home treatment with rest and antiinflammatory drugs are the main treatment techniques. It is okay if your child keeps the leg turned out. Any position that is comfortable will help the healing process. The child is usually already limiting how much weight is put on that leg. If not, every effort should be made to avoid weight-bearing.
Vigorous physical activities such as running, jumping, and participating in sports activities should be avoided during the acute phase. Your doctor will let you know if crutches are needed to help limit weight-bearing through that leg. If crutches are advised, they will only be needed for a few weeks.
Surgery is not usually necessary. In severe cases of transient synovitis children may be hospitalized for observation and leg traction. Applying pull on the hip through the leg can reduce the pressure inside the joint capsule. If the child is cooperative, home traction may be possible.
Rehabilitation of Transient Synovitis of the Hip
What should I expect as I recover?
A rehab program is not usually needed. Most of the time, this condition resolves (goes away) within a week or two. The child will naturally start to increase activity as he or she starts to feel better. The condition can come back. If this happens, it will most often occur during the first six months after it first appears.
Follow-up with your doctor is important. If the symptoms aren’t improved or improving after seven to 10 days, then contact your child’s doctor. There could be something else wrong with your child’s hip. Further diagnostic testing may be required. Even if your child has recovered fully, a repeat X-ray is advised. This should be done about six months after the first episode occurs. It will help identify any early signs of Legg-Calve-Perthes disease.
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