What Does Scoliosis Look Like? A Visual Guide for Parents and Patients

Children in Singapore schools are screened for scoliosis. Where something is picked up, parents are sent a letter advising further assessment by a healthcare professional.

Follow the letter through rather than setting it aside. It is not a diagnosis. Most children referred turn out not to need treatment — but the only way to know is to have the back examined and, where needed, the curve measured.

Seeing an experienced practitioner early does three things:

• settles the worry when the curve is small, or the asymmetry is normal;
• keep follow-up to a minimum in low-risk cases;
• starts the few children whose curves are likely to progress on treatment while it works best.

Adults are not screened. A curve is usually found by chance, on a chest X-ray taken as part of a health screening package.

Stand them relaxed, feet together, arms loose, back facing you, in good light. A swimsuit or lifted shirt works far better than a school uniform. You are looking for asymmetry.

1. Shoulder height. Is one shoulder sitting higher than the other?
2. Shoulder blades. Does one wing out more, or sit further from the spine?
3. The waist. Is the gap between arm and waist bigger on one side? Often the first thing a parent notices.
4. Hip and pelvis level. Does one hip look higher, or one leg seem longer?
5. Head position. Does the head sit centred over the pelvis, or slightly off to one side?
6. How clothes hang. A hemline that dips, a strap that slips off one side. Clothes show asymmetry before the eye does.

None of these alone means scoliosis — almost everybody is slightly asymmetric. What matters is a difference that is obvious, or becoming more obvious during a growth spurt.

The same manoeuvre used in school screening, and the one that reveals rotation. Switch the model to Forward bend with ribs on to see what the examiner looks for.

1. Stand behind the person, at their eye level when they bend — sitting on a low stool helps.
2. Feet together, knees straight, palms together, arms hanging down.
3. Ask them to bend slowly forward from the waist until the back is roughly horizontal.
4. Look along the back from the neck down to the pelvis, not at it from above.
5. You are looking for one side of the back sitting higher than the other — a rib prominence in the upper back, or a fullness in the lower back.

A rotating vertebra drags its ribs with it. Standing upright, soft tissue disguises this; bending forward removes the disguise and the rotation shows as a hump.

A clinician then puts a number on the rotation with a scoliometer, a small spirit-level-like instrument laid across the highest point of the hump. Parents are often taught to do the same.

Families are given two figures in degrees and reasonably assume they mean the same thing. They do not — a scoliometer reading of 8° is not a curve of 8°.

They are related but do not convert into one another: the same rotation can sit alongside a range of Cobb angles, depending on the curve’s level and rib shape. The scoliometer decides whether to X-ray; it does not replace the X-ray.

The number on the model is the Cobb angle: the tilt between the two most angled vertebrae, measured on a standing X-ray. It drives every treatment decision, and three things about it are rarely explained to families.

• Position changes the number. An X-ray taken lying down reads lower than one taken standing, because gravity is no longer loading the curve. Films taken in different positions cannot be compared.
• Posture changes the number. Standing tall and slouching give different angles on the same spine, on the same day — which is why the X-ray is taken in a standardised standing position.
• Within 5° is not a change. Measuring a Cobb angle carries about 5° of error between films and between readers. A curve reported as 22° one year and 26° the next has, in all likelihood, not moved.

The bands used on the model:

• Under 10° — not scoliosis. Minor asymmetry is normal and needs nothing.
• 10–20°, mild — observation, with repeat X-rays timed to the growth spurt. Most mild curves never progress.
• 21–44°, moderate — in a growing child, the range where bracing is usually discussed, to stop progression before it reaches the surgical range.
• 45° and above, severe — surgery is typically discussed, depending on remaining growth, curve pattern, and how it affects the child.

The same angle can mean different things. A 30° curve in a girl entering her growth spurt is far more urgent than 30° in a woman of 40.

The number is not the decision. The doctor’s role is to synthesise what the X-rays show with the clinical assessment — age and remaining growth, the pattern of the curve, how it has behaved over time, and how it is affecting the child — and make a judgment from the whole picture. A single figure on a report cannot do that.

Arrange an assessment if any of these apply. None means something is wrong — only that it is worth measuring rather than watching.

• One side of the back is clearly higher than the other on forward bending.
• Shoulders, waist or hips look obviously uneven when standing.
• The asymmetry has become more noticeable over the past few months.
• A school screening has referred your child for further assessment.
• A parent, sibling or close relative has scoliosis — it clusters in families.
• Your child is in or approaching their growth spurt and you have noticed any of the above.

Seek medical attention promptly, rather than waiting for a routine appointment, if there is:

• back pain that wakes the child from sleep, or pain with fever or weight loss;
• numbness, weakness, or clumsiness in the hands or legs;
• any change in bladder or bowel control;
• a curve appearing in a child under 10 — a different problem from adolescent scoliosis, assessed differently.

An assessment is straightforward: an examination, and usually one standing X-ray. In most people it confirms the asymmetry is normal. When it does find a curve, finding it early keeps the options open — a curve caught at 20° has choices a curve found at 60° no longer has.

Can I diagnose scoliosis at home?

No. You can notice asymmetry, and take a scoliometer reading if shown how — both useful. But scoliosis is defined by a Cobb angle of 10° or more on a standing X-ray, which no app can measure. What you see at home decides whether to get the curve measured, not what the answer is.

Are smartphone scoliometer apps accurate?

For trunk rotation, a calibrated inclinometer app performs comparably to the handheld instrument, and parents taught to use one produce readings close to a specialist’s. It cannot give a Cobb angle or a diagnosis. Use it to track change between appointments, after someone has shown you the technique — positioning determines whether the number means anything.

Does a heavy school bag cause scoliosis?

No — and this is the question parents ask me most, usually carrying some guilt. Adolescent idiopathic scoliosis is not caused by bags, posture, sport or sleeping position. Heavy bags can cause back pain, worth addressing on its own terms, but they do not cause a curve. Nothing you did caused your child’s scoliosis.

My child has no pain. Can it still be scoliosis?

Yes — that is the usual picture. Most adolescent curves are painless, which is exactly why they are missed. Significant pain alongside a curve is less typical and deserves assessment in its own right.

Will my child definitely need surgery?

No. Most curves never reach the surgical range: the majority are managed by observation alone, a smaller group is braced during growth, and surgery is for the minority whose curves are large or progressing despite bracing.

The Cobb angle went from 22° to 26°. Is the curve getting worse?

Probably not. Cobb angle measurement carries about 5° of error, so a 4° difference between two films is within the noise. Progression means a consistent change across films taken the same way, judged alongside how much growth is left — not a single higher number.

Is it too late if the growth spurt has finished?

Not too late to assess, though the goals change. Once growth is complete a curve is much less likely to progress quickly, so the focus shifts from preventing progression to managing symptoms and monitoring larger curves.

Do only girls get scoliosis?

No. Curves needing treatment are more common in girls, which is why the school programme starts earlier for girls — but boys develop scoliosis too, and are screened as well. The belief that it is a girls’ condition is why a curve in a boy is sometimes dismissed at home.