What Is Adolescent Idiopathic Scoliosis, and What Should Parents Do First?
Adolescent idiopathic scoliosis is a sideways curve of the spine that appears during a teenager's growth spurt, usually between ages 10 and 18, with no known single cause. Most curves are mild, but some progress quickly during growth. Early detection, proper monitoring and low-dose imaging are the most important first steps a parent can take.
Key takeaways
- Adolescent idiopathic scoliosis affects roughly 2 to 3 in every 100 teenagers, most commonly girls.
- The curve can worsen quickly during a growth spurt, so repeat imaging is often necessary.
- Every repeat X-ray adds radiation. EOS imaging uses about 90% less radiation than a standard X-ray, around ten times less.
- A standing, weight-bearing image shows the true curve under gravity, not the relaxed position seen when lying down.
- Early specialist referral and careful monitoring give the best chance of catching progression before it becomes severe.
Finding out your teenager has a curved spine is unsettling. You may have noticed something yourself, or a school screening, GP or physiotherapist may have flagged it. Either way, the most common question parents ask is: what do we do now?
This page explains what adolescent idiopathic scoliosis is, what to look for, and why the type of imaging you choose matters, especially when your child may need scans more than once.
What are the signs of scoliosis in teenagers?
The earliest signs are usually visible, not painful. Most teenagers with adolescent idiopathic scoliosis do not feel pain at diagnosis. Instead, parents or teachers tend to notice asymmetry in posture or body shape.
One shoulder sits higher or more forward than the other, often noticed in photos or school uniforms.
When bending forward, one side of the ribcage sticks out more. This is checked in the Adams forward bend test.
The gap between one arm and the body looks different on each side, or clothing hangs unevenly.
The whole body appears to lean to one side, or the head does not sit centred over the pelvis.
If you notice uneven shoulders or any of these signs, it does not automatically mean the curve is severe. But it does mean imaging is worthwhile to establish a baseline and guide next steps.
Why does adolescent idiopathic scoliosis progress during growth?
Growth is the main driver of curve progression. The faster a teenager is growing, the higher the risk that a scoliosis curve will worsen. This is why the condition is most closely monitored during puberty, when growth spurts are at their peak.
Clinicians assess skeletal maturity to estimate how much growth remains. If a teenager still has significant growing to do and the curve is already moderate, more frequent monitoring, and potentially bracing, may be recommended.
"Idiopathic" simply means there is no single known cause. Research points to a combination of genetic, hormonal and biomechanical factors, but no individual trigger has been identified. It is not caused by heavy bags, poor posture or sport.
Why does radiation dose matter for scoliosis monitoring?
Radiation dose matters because adolescent idiopathic scoliosis often requires repeat imaging over months or years to track whether the curve is stable or progressing. Each standard X-ray adds cumulative radiation to a young person's body during a period of rapid cell growth.
This is where the choice of imaging technology becomes important for parents. EOS imaging uses about 90% less radiation than a standard X-ray, around ten times less. Over a monitoring programme of several scans, that difference adds up significantly.
Concerned about radiation? Learn more about whether is an EOS scan safe for young patients.
The Scoliosis Research Society and the British Scoliosis Society both recognise the importance of minimising radiation exposure during growth. Low-dose imaging is not a luxury. For a teenager who may need scans every six months, it is a practical safeguard.
How is scoliosis assessed when standing up versus lying down?
A standing image shows the spine as it actually behaves under gravity and body weight. When your teenager lies down for a conventional scan, muscles relax, the curve can flatten, and the image may underestimate the real situation.
Shows the true curve under gravity. The whole body, from the skull to the feet, is captured in a single standing image. This reveals how the spine, pelvis and legs interact as a connected chain, so compensatory shifts are visible.
EOS captures this full picture at about 90% less radiation than a standard X-ray. That matters when repeat scans are planned.
May underestimate the curve. When lying flat, gravity is removed and muscles relax. The spine can appear straighter than it really is. This can affect decisions about whether bracing or closer monitoring is needed.
Standard supine imaging also typically captures only the spine, not the pelvis and legs together, so compensation patterns may be missed.
At ScanAlign, low dose standing imaging, the scan is taken with your teenager standing in their natural posture. The result is a full-length, weight-bearing picture of alignment that gives the treating specialist accurate information to work with.
When is MRI the better choice? EOS shows bones, joints and alignment clearly. If the specialist suspects a nerve problem, disc issue or spinal cord concern, MRI is usually the better tool because it shows soft tissue in detail. In many cases, both types of imaging are used together.
What should parents do first if they suspect scoliosis?
The most helpful thing you can do is get a clear baseline image and a specialist opinion. Acting early does not mean rushing into treatment. It means having the information to make calm, well-informed decisions.
Ask your teenager to stand naturally, then bend forward at the waist with arms hanging. Look for uneven shoulders, a rib hump, or a waist crease that is deeper on one side. This is the Adams forward bend test, and it takes seconds.
Your GP can perform a clinical examination and refer onwards. You can also self-refer directly for imaging if you prefer not to wait.
A full-body standing scan establishes a baseline. Because scoliosis monitoring means repeat imaging, choosing a low-dose option from the start reduces cumulative radiation across the whole programme. Learn about paediatric imaging at ScanAlign.
Your report and images go to the treating clinician. They will use the findings to decide whether observation, bracing or further investigation is appropriate. ScanAlign does not provide treatment. It provides the imaging that informs treatment elsewhere.
Important: If your teenager develops sudden severe back pain, numbness or weakness in the legs, or any loss of bladder or bowel control, seek urgent medical attention through your GP, NHS 111 or A&E. These symptoms need immediate assessment, not a routine scan.
Frequently asked questions about adolescent idiopathic scoliosis
It is most commonly diagnosed between the ages of 10 and 18, during or just before puberty. Curves can appear earlier, but the adolescent form specifically develops during this growth window.
Most teenagers do not have significant pain at the time of diagnosis. The condition is usually noticed because of visible asymmetry rather than discomfort. If pain is present, the clinician may investigate other possible causes alongside the scoliosis.
No. Research has not shown a link between bag carrying and the development of idiopathic scoliosis. The term "idiopathic" means there is no single known cause. Genetics and growth patterns are considered the main factors.
This depends on the size of the curve and how much growth remains. Some teenagers are scanned every four to six months during peak growth. Others may need only an annual check. Your specialist will set the schedule based on the individual case.
Teenagers are more sensitive to radiation than adults, and scoliosis monitoring often means multiple scans over several years. EOS imaging uses about 90% less radiation than a standard X-ray, around ten times less. Over a full monitoring programme, the cumulative difference is substantial.
No. You can self-refer directly. Many parents choose to do this when they want a baseline image quickly, without waiting for an NHS referral pathway.
It is a simple screening check. Your teenager bends forward at the waist with their arms hanging down. You look from behind for a hump on one side of the ribcage or lower back. A visible hump suggests a rotational curve and warrants further imaging.
Bracing is recommended for moderate curves in teenagers who are still growing. The decision is made by the treating specialist based on the curve size, growth remaining and other factors. Imaging provides the measurements that guide this decision, but ScanAlign does not prescribe braces or treatment.
Pricing details are available on our cost and FAQs page. You can also ask about costs during your free video consultation before committing to anything.
Your teenager stands still inside the EOS scanner for around 15 to 20 seconds. It is open, not enclosed, and there is no need to undress fully. The process is quick and straightforward. You can book a paediatric scoliosis scan online or start with a free video consultation.
Worried about your teenager's spine?
Start with a free video consultation. We will help you decide whether a standing scan is the right next step, with no obligation.
Book a free video consultationWritten by Abbas Dhami (Specialist Diagnostic Radiographer)
Sources
- Weinstein SL, Dolan LA, Wright JG, Dobbs MB. Effects of bracing in adolescents with idiopathic scoliosis. New England Journal of Medicine. 2013;369(16):1512-1521.
- Ilharreborde B, Ferrero E, Alison M, Mazda K. EOS microdose protocol for the radiological follow-up of adolescent idiopathic scoliosis. European Spine Journal. 2016;25(10):3234-3242.
- National Institute for Health and Care Excellence (NICE). Scoliosis overview. NICE Pathways. Available at: pathways.nice.org.uk
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.