Juvenile Ankylosing Spondylitis
Juvenile ankylosing spondylitis primarily affects the spine and the sites where tendons attach to bone.
Juvenile ankylosing spondylitis (JAS) is a type of inflammatory arthritis that mostly affects the sacroiliac joint (where the pelvis and spine meet), spine and entheses — where tendons and ligaments attach to bone. JAS is a systemic disease, which means it may also affect other body parts and organs. The disease tends to run in families and affects boys more frequently than girls.
Causes
The exact cause of the juvenile ankylosing spondylitis is not clear. The disease is strongly associated with a gene called HLA-B27. About 80% to 90% of children with JAS have the HLA-B27 gene. But having the gene doesn’t mean someone will get AS.
Researchers believe the disease is triggered when children with the gene are exposed to a virus, bacteria or other outside factor.
Symptoms
Symptoms usually develop slowly over several weeks or month. At first, symptoms may mirror enthesitis-related arthritis, or arthritis that affects the places where the tendons, ligaments and muscles attach to the bone. Pain may be felt in the hips, knees or heels first, and then pain in the low back and buttocks may follow. Symptoms include:
- Pain, swelling, redness and warmth in the toes, heels, ankles, buttocks, knees, rib cage, upper spine, shoulders and neck
- Back pain during the night or early morning
- Stiffness in the morning or after long periods of inactivity
- Shortness of breath
- Stooped posture
- Fatigue
- Mild fever
- Appetite loss
Other Health Effects
Over time, the joints and bones of the spine (vertebrae), including the sacrum (the triangle-shaped bone at the bottom of the spine), may grow together (fuse). This causes the spine to become stiff and hard to move. The rib cage also may fuse, making it hard to breath.
Other parts of the body can be affected by JAS, including:
- Eyes. Dryness, pain, redness, sensitivity to light and trouble seeing caused by chronic eye inflammation (uveitis or iritis).
- Digestive Tract. Chronic inflammation may lead to inflammatory bowel disease, causing abdominal pain and diarrhea.
Diagnosis
Because spine involvement may not occur until years after other symptoms begin, diagnosing JAS can be difficult. But it’s important to see a doctor as soon as joint pain begins. A primary care doctor may be the first person you see, but he or she may refer you to a doctor that specializes in treating inflammatory arthritis (rheumatologist).
There is no single test to diagnose JAS. The doctor will ask about medical history, perform a physical exam and order laboratory tests to rule out other causes of joint pain.
- Medical history. The doctor will ask about symptoms, when they started, if they come and go, current medical conditions, medication use and whether family members have arthritis.
- Physical examination. The doctor will look for signs of tenderness, swelling and pain in the joints, including the spine, wrists, knees and feet. He or she may also check the eyes.
- Blood tests. The doctor may order a test for the HLA-B27 gene, C-reactive protein (CRP), erythrocyte sedimentation rate (ESR or sed rate), and comprehensive metabolic panel tests.
- Imaging tests. The doctor may order X-rays, ultrasound, MRI or CT scans of the pelvis and spine to look for signs of damage.
Treatment
There is no cure for JAS, but treatment focuses on
- Relieving pain and stiffness.
- Preventing spinal deformity.
- Preventing joint and organ damage.
- Preserving joint function and mobility.
- Improving quality of life.
Treatments
Medications
• Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)
These are the most commonly used drugs to treat JAS and help relieve pain. They include over-the-counter drugs, such as ibuprofen (Advil) and naproxen (Aleve), as well as prescription drugs, such as indomethacin, diclofenac or celecoxib.
• Disease-Modifying Antirheumatic drugs (DMARDs)
Many children will be prescribed a DMARD to reduce disease activity, ease pain and stiffness, and reduce swelling. Traditional DMARDs, such as sulfasalazine and methotrexate, work by suppressing the immune system so it doesn’t attack the joints.
• Biologics
A type of DMARD, biologics target certain steps or chemicals in the inflammatory process to control disease activity. Biologics are self-injected or given through the vein at a medical facility.
• Targeted Synthetic DMARDs
These disease-modifying drugs target a specific part of the immune system to control a disease, unlike traditional DMARDs, which have a widespread effect on the immune system. And unlike biologics, which are injected or infused, these DMARDs are pills taken orally.
• Corticosteroids
These quick-acting, anti-inflammatory drugs (prednisone for example) are used for the shortest time and the lowest possible doses because of their side effects, including growth problems in children. Sometimes, doctors use them to manage the disease until other medications start working. They work best for arthritis in places other than the spine, because they don’t reduce pain or stiffness in the spine.
Physical Therapy and Assistive Devices
Exercise
Low-impact exercises – including walking, swimming, biking and yoga – are best. Stretching exercises, especially after a warm bath or shower, are also important to help ease pain and relieve stiffness.
Surgery
Self-Care
Diet
There’s no special diet for JAS, but eating the anti-inflammatory foods found in a Mediterranean diet (fatty fish, fruits, vegetables, whole grains and extra virgin olive oil) and limiting fatty, sugary and processed foods may help.
Posture
Good posture can help ease pain and stiffness. Adjust desk chair and/or computer monitor so it is at eye-level. Alternate between standing and sitting and use a cushion to support a painful back. Avoid “texting neck” when using a cellphone (tilting the neck down to read texts).
Coping and Support
Living with a chronic illness can contribute to emotional distress and even depression, but friends and family can provide support during tough times. Kids with JAS can meet others like them at various Arthritis Foundation JA events held throughout the year and their parents can get and share support virtually in our Connect Groups. Therapists and psychologists can also help kids deal with tough emotions and teach positive coping strategies. For more resources, call our Helpline at 800-283-7800.
10 to 11 is the typical onset age for JAS
People with ankylosing spondylitis have the HLA-B27 gene
10 to 20 percent of adult ankylosing spondylitis cases start in childhood
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