If your child has just been diagnosed with scoliosis, the first question most parents ask is: Does this mean surgery?
The answer, for most children, is no. The majority of patients with adolescent idiopathic scoliosis (AIS) are treated with observation alone, or with bracing during the growing years. Surgery is recommended only in specific situations where the curve is severe enough that the long-term risks of leaving it untreated outweigh the risks of the operation itself.
That said, knowing when surgery is the right answer — and finding the right surgeon to make that call — matters enormously. This guide walks you through how spine surgeons think about the decision.
First: The Basics of Scoliosis Severity
Scoliosis severity is measured using the Cobb angle — the standard method for quantifying how much the spine curves on an X-ray. A Cobb angle is measured in degrees, and general treatment guidelines are organized around it:
- Under 25°: Typically observed with periodic X-rays. No active treatment needed in most cases.
- 25° to 45°: Bracing is usually recommended for skeletally immature patients (those still growing) to prevent the curve from worsening.
- 45° to 50° or more: Surgery is typically recommended, particularly if the patient is still growing or the curve is progressing.
These are general thresholds, not rigid rules. Every patient is different, and the decision about surgery involves more than just the number.
The Key Factors That Go Into the Decision
When a surgeon evaluates a patient for potential scoliosis surgery, the Cobb angle is one data point among several. Here is what else matters:
1. Skeletal Maturity
A curve in a child who is still growing carries more risk of progression than the same curve in a fully grown teenager. Skeletal maturity is assessed using bone age and growth indicators visible on X-ray, including the Risser sign (which measures the maturity of the pelvic growth plate). A child with a 40° curve and significant growth remaining may be a stronger surgical candidate than a teenager with the same curve who is nearly done growing.
2. Rate of Progression
How fast is the curve changing? A curve that has grown by 10 degrees over the past six months tells a different story than one that has been stable for two years. Progression of 5 degrees or more per visit is generally considered significant, particularly during the adolescent growth spurt.
3. Curve Pattern and Location
Not all curves are the same. A curve in the thoracic spine (mid-back) behaves differently from one in the lumbar spine (lower back) or a double major curve that involves both regions. Thoracic curves tend to progress more than lumbar curves and are more likely to affect appearance and, in very severe cases, lung function. The pattern of the curve affects which levels need to be fused and how the surgery is planned.
4. Symptoms
Most adolescents with scoliosis do not have significant pain. When pain is present — especially if it is severe, constant, or associated with neurological symptoms like weakness or numbness — it warrants closer evaluation and may support an earlier surgical recommendation. Pain alone does not trigger surgery, but it is factored into the overall picture.
5. The Long-Term Natural History
Research on the natural history of untreated scoliosis informs a key part of the surgical decision. Curves above 50 degrees at skeletal maturity tend to progress slowly but steadily in adulthood — at a rate of approximately 1 degree per year. Over decades, a 55° curve at age 18 may become a 75° or 80° curve by middle age, with increasing pain, deformity, and in severe cases, cardiopulmonary compromise. This long-term trajectory is part of why surgery is recommended at meaningful thresholds rather than waiting until symptoms appear.
What Scoliosis Surgery Actually Does
The goal of surgery for AIS is to correct the curve as much as safely possible, then fuse the involved vertebrae so the correction is permanent. This is typically done through a posterior approach (through the back) using pedicle screws, connecting rods, and bone graft.
Modern techniques have significantly improved both the safety and the outcomes of this surgery. Surgeons at high-volume centers now routinely use:
- Intraoperative neuromonitoring (IONM): Continuous monitoring of spinal cord and nerve function throughout the procedure, allowing the surgical team to detect and respond to any changes in real time.
- Robotic-assisted navigation: Computer-guided systems that allow pedicle screws to be placed with a high degree of precision, reducing the risk of misplacement.
- Real-time 3D imaging: Intraoperative CT-based imaging that confirms screw position before the patient leaves the operating room.
The result, in the hands of an experienced surgeon, is a well-corrected spine, a straight and balanced posture, and a fusion that is built to last a lifetime.
What Happens If Surgery Is Delayed or Avoided?
For curves that do not meet surgical thresholds, avoiding surgery is absolutely the right call. For curves that do meet those thresholds, delay carries real risks. The larger a curve becomes before surgery, the more levels typically need to be fused to achieve correction and balance. More fusion levels mean a longer operation, a longer recovery, and less spinal mobility preserved. Correction of a 70° curve is technically more demanding and carries more risk than correction of a 50° curve in the same patient.
This is one reason why a timely evaluation by an experienced scoliosis surgeon matters, even for patients who may ultimately not need surgery. Knowing where you stand — and having a plan — is always better than watching and waiting without guidance.
Questions to Ask at Your Consultation
Whether you are seeking a first opinion or a second one, here are the questions worth asking any surgeon you see:
- What is my child’s exact Cobb angle, and what is the curve pattern?
- How skeletally mature is my child, and how does that affect the risk of progression?
- What is the likelihood this curve will progress without surgery?
- If surgery is recommended, how many levels would be fused?
- What are the risks,?
- Do you use robotic guidance and intraoperative neuromonitoring?
A good surgeon will welcome these questions and answer them directly. If you feel rushed, dismissed, or unable to get clear answers, seeking a second opinion is entirely appropriate — and most experienced scoliosis surgeons will tell you the same.
When to Seek a Second Opinion
Second opinions are not just acceptable in scoliosis care — they are often encouraged. AIS surgery is elective in the sense that it is planned rather than emergent, which means you have time to make an informed decision. If your child has been told surgery is necessary and you are unsure, a consultation at a high-volume deformity center can provide clarity and peace of mind. Conversely, if you have been told surgery is not yet needed but the curve has been rapidly progressing, a second set of eyes may be equally valuable.
About Dr. Zeeshan Sardar
Dr. Sardar is Co-Chief of Spinal Deformity Surgery at NewYork-Presbyterian / Columbia University and one of New York’s most experienced adolescent scoliosis surgeons. He completed his advanced spinal deformity fellowship at Columbia University and NewYork-Presbyterian and sees patients from across the United States and internationally. To schedule a consultation, call 212-932-5187 or visit the contact page.
This article is for educational purposes only and does not constitute individualized medical advice. Please consult a qualified spine specialist to discuss your child’s specific condition.
Sardar Spine | NYC Spinal Deformity & Scoliosis Surgeon 