Scoliosis Bracing

A scoliosis brace is a custom-made rigid jacket, usually moulded plastic, worn around the trunk to hold and gently correct the shape of a growing spine. It is important to understand the honest aim of bracing. The primary purpose of a brace in adolescent idiopathic scoliosis is not to make an existing curve disappear; it is to stop the curve getting worse while the child is still growing, and in doing so to reduce the chance that the curve ever reaches the size at which surgery is considered. Some curves do improve in the brace, but preventing progression is the realistic and evidence-based goal. A brace does not cure scoliosis, and it does not usually straighten the spine permanently. What it does — and this is genuinely valuable — is buy control over a curve during the years of fastest growth, when a curve is most likely to advance.

Scoliosis in adolescents tends to progress during periods of rapid skeletal growth and to slow markedly once growth is complete. This is why bracing is a treatment of the growing spine. The more growth a child has left, the greater the risk that a curve will progress, and the more a brace has to offer. We estimate remaining growth from age, from whether periods have started in girls, and from skeletal maturity markers such as the Risser sign seen on X-ray. A brace prescribed early, in a skeletally immature child with a moderate curve, is working with the biology of growth on its side. Once the spine has finished growing, a brace can no longer change the natural course of the curve, which is why bracing is generally stopped at skeletal maturity.

Bracing is typically considered for a child who is still growing and who has a curve in the moderate range — broadly a Cobb angle of around 20 to 40 degrees — that is either already documented to be progressing or judged to be at high risk of doing so. Very small curves are usually watched rather than braced, because many never progress far enough to matter. Very large curves, beyond about 45 to 50 degrees, have generally moved past the point where a brace can reliably control them, and here a surgical opinion becomes the more relevant conversation. Between those extremes lies the group in whom bracing has most to offer. These are guides, not rigid rules: the decision to brace weighs curve size, curve pattern, how much growth remains, how fast the curve is moving, and the young person's own circumstances and wishes. That individual judgement is exactly what a specialist assessment is for.

A brace works by applying corrective forces to the trunk. Older designs relied on three-point pressure systems to push a curve towards the midline; modern braces aim for a genuinely three-dimensional correction, because scoliosis is itself a three-dimensional deformity involving side-to-side curvature, rotation and changes in the normal front-to-back profile of the spine. A well-designed brace applies pressure over the convex prominences of the curve while leaving space, or expansion room, on the concave side into which the spine and ribs can move. The immediate reduction in the curve that we see on an X-ray taken with the brace on — the so-called in-brace correction — is one of the most useful early signs we have, and I will come back to why it matters so much. The forces a brace applies are corrective while it is worn; the lasting benefit comes from applying them consistently through the growing years so the curve does not run away.

Braces are prescribed for different numbers of hours a day depending on the design and the situation. Full-time, or nearly full-time, rigid bracing generally means wearing the brace for around 18 to 23 hours a day, coming out mainly for washing, sport and swimming. Some braces are designed specifically for night-time wear, taking advantage of lying down to apply a stronger, sometimes over-corrective bend to the spine for eight or so hours overnight. There is also a role, in selected milder curves, for part-time regimens. The general principle established by the evidence is that, for full-time braces, more hours of genuine wear give better results — bracing shows a dose-response relationship. Night-time braces work on a different principle and can be effective for particular curve types and sizes, with the real-world advantage that they interfere far less with school and social life. Which regimen suits a given child depends on the curve and is part of the prescribing decision.

For decades bracing was the standard treatment for scoliosis without ever having been tested in a high-quality trial, and some questioned whether it worked at all. That changed with the BrAIST study — the Bracing in Adolescent Idiopathic Scoliosis Trial — published in the New England Journal of Medicine in 2013. BrAIST compared bracing against watchful waiting in adolescents with curves at risk of progression, and it was stopped early because the benefit of bracing was so clear. Bracing significantly reduced the chance of a curve progressing to the 50-degree surgical threshold, and — importantly — there was a strong dose-response relationship: the more hours a day the brace was actually worn, measured objectively by a temperature sensor, the better the outcome. This is the single most important piece of evidence in the field, because it settled the question of whether bracing works, and it showed that wear time is decisive.

BrAIST did not stand alone. An earlier and much-cited meta-analysis by the Scoliosis Research Society, pooling nearly two thousand patients, found that success rates rose steadily with brace wear — from around 60 percent with eight hours a day, to 62 percent with sixteen hours, to 93 percent with twenty-three hours a day — and that the longest-wear regimens clearly outperformed observation and electrical stimulation. Systematic reviews and meta-analyses comparing different bracing concepts have reported average success rates in the region of 70 to 80 percent for rigid full-time and for night-time braces, against roughly 50 percent for observation alone. International guidelines from SOSORT and the SRS recommend bracing for progressive curves during growth. The honest summary is that bracing works to prevent progression and reduce the need for surgery, that wearing it as prescribed is what makes it work, and that no single brace design has been proven clearly superior to the others.

Several factors influence how well a brace controls a curve, and understanding them helps set realistic expectations. The most consistent is wear time: braces work when they are worn, and the biggest single cause of a brace failing to help is that it is not worn enough. Objective monitoring with temperature sensors has repeatedly shown that real wear is often well below what is prescribed and below what patients report, which is why honest, supported adherence matters so much. A second powerful factor is the initial in-brace correction — how much the curve reduces on the first X-ray with the brace on. A good early correction is one of the strongest predictors of a successful final outcome. Remaining growth matters too: the more immature the skeleton, the more a brace has to work with, but also the longer it must be worn. Curve pattern and rotation play a part, and the response of the curve six months into treatment, measured out of the brace, gives a valuable early read on whether things are on track.

I would be doing families a disservice if I painted bracing as easy. Wearing a rigid jacket for most of the day and night, through the self-conscious teenage years, is genuinely hard, and it is right to acknowledge that. Studies using the scoliosis-specific quality-of-life questionnaire show that bracing can affect self-image and daily activity, and that a majority of young people report some psychological or social impact from wearing a brace. These effects are real and should never be dismissed. At the same time, modern braces are lower-profile and more wearable than older designs, most young people can wear normal clothes over them, and the great majority who complete treatment go on to full, active lives with outcomes comparable to their peers. The task of the whole team — surgeon, orthotist, physiotherapist and family — is to support the young person through a demanding treatment, because the payoff, avoiding a larger curve and possibly surgery, is worth it.

Bracing is often combined with scoliosis-specific physiotherapy exercises, which aim to support posture, trunk strength and the young person's engagement with treatment; the exercises are delivered by specialist physiotherapists, not by me. Throughout brace treatment the spine is monitored with periodic clinical review and X-rays, both to check that the curve is being controlled and to keep radiation exposure as low as possible. As the child approaches the end of growth, we plan how and when to stop the brace — usually a gradual process once skeletal maturity is reached — and we continue to keep an eye on the curve, since a proportion of curves can change a little even after bracing ends. Bracing is therefore not a single event but a several-year partnership, and the monitoring is as much a part of the treatment as the brace itself.

Let me be clear about where I fit in. I diagnose the scoliosis, assess how much it threatens the spine, and decide with the family whether bracing is the right path. I prescribe the brace and set the goals; the specialist orthotist designs, makes and fits it, and adjusts it as the child grows; the physiotherapist supports the exercise side; and I monitor the spine over the years of treatment. Bracing is not a substitute for surgery when a curve has already crossed the threshold where surgery is the appropriate treatment, and it cannot be relied upon to reverse a large, stiff curve. Nor is bracing a guarantee — some curves progress despite an excellent brace worn faithfully, and that is not a failure of effort. But used in the right child, at the right time, and worn as prescribed, bracing is one of the most effective things we can offer to keep a growing spine out of the operating theatre.

• —Weinstein SL, Dolan LA, Wright JG, et al. Effects of bracing in adolescents with idiopathic scoliosis (BrAIST). N Engl J Med 2013. (PMC3913566)
• —Dolan LA, Weinstein SL, et al. Design of the Bracing in Adolescent Idiopathic Scoliosis Trial (BrAIST). (PMID 24026162 / PMC4536980)
• —Evaluation of TLSOs in the Bracing in Adolescent Idiopathic Scoliosis Trial (BrAIST). (PMC3675346)
• —BrAIST: Development and validation of a prognostic model using the Simplified Skeletal Maturity System. (PMID 31731999 / PMC6939758)
• —Dolan LA, Weinstein SL. To BrAIST or not to BrAIST: decisions of 1131 eligible patients. (PMC3304793)
• —Negrini S, et al. 2016 SOSORT guidelines: orthopaedic and rehabilitation treatment of idiopathic scoliosis during growth. (PMID 29435499 / PMC5795289)
• —Negrini S, et al. 2011 SOSORT guidelines. (PMID 22264320 / PMC3292965)
• —Negrini S, et al. Braces for idiopathic scoliosis in adolescents (Cochrane review). (PMID 20461027)
• —Rowe DE, et al. A meta-analysis of the efficacy of non-operative treatments for idiopathic scoliosis. (PMID 9160938)
• —Costa L, et al. The effectiveness of different concepts of bracing in AIS: systematic review and meta-analysis. (PMC8156678)
• —The efficacy of night bracing in the treatment of AIS: a systematic review. (PMID 38999227 / PMC11242083)
• —Negrini S, et al. Effect of bracing and other conservative interventions in AIS: systematic review of clinical trials. (PMID 16305271)
• —Influence of specific interventions on bracing compliance — systematic review including sensor monitoring. (PMC10490632)
• —Rahman T, et al. Compliance monitoring of brace treatment for idiopathic scoliosis. (PMID 15371711)
• —Adherence and radiological outcomes using thermal sensors: a real-world study. (PMC12734021)
• —Initial in-brace correction: can Cobb angle predict brace outcome in AIS? (PMC8946904)
• —van den Bogaart M, et al. Predictive factors for brace treatment outcome in AIS: a best-evidence synthesis. (PMID 30607519)
• —Evaluation of predictors and outcomes of bracing with emphasis on in-brace correction. (PMC7047298)
• —Six-month out-of-brace evaluation as the key predictor of treatment success. (PMC12840482)
• —Danielsson AJ, et al. Long-term results after Boston brace treatment in AIS. (PMC2743640)
• —Outcome assessment of bracing in AIS using the SRS-22 questionnaire. (PMID 16896864 / PMC2267629)
• —Quality of life and patient satisfaction in bracing treatment of AIS. (PMC6295031)
• —Brace management in adolescent idiopathic scoliosis (review). (PMC2816747)
• —A history of bracing for idiopathic scoliosis in North America. (PMC2816759)
• —Brace treatment for adolescent idiopathic scoliosis (review). (PMC6024899)