The Core Concern
One of the first questions parents ask after their child is recommended for scoliosis surgery is: "Will this stop him from growing?" It is a fair and important question. Spinal fusion does affect growth in the fused segment — but understanding exactly how, and when it matters, is essential for making the right decision.
How Fusion Affects Spinal Growth
The human spine grows from multiple growth plates along the vertebrae. When two or more vertebrae are fused surgically, growth from those segments stops. The more levels fused, the greater the potential effect on final trunk height. This is why the timing of surgery matters enormously.
Adolescent Idiopathic Scoliosis (AIS): The Good News
By the time a curve reaches the 45–50° surgical threshold, most adolescents have already completed 85–95% of their spinal growth. Studies consistently show that fusion after Risser grade 2–3 results in less than 2 cm of final height difference compared to unfused peers.
In fact, correcting a large scoliosis curve often adds centimetres of apparent height, because the spine straightens rather than collapsing sideways. Many patients are taller after surgery than before.
For adolescents, fusion corrects the curve and often increases apparent height — the growth trade-off is far smaller than most parents fear.
Early Onset Scoliosis: When Growth Really Does Matter
The situation is very different for children under age 10. In this group, the spine still has significant growth remaining and the thoracic cage is still developing. Fusing a young child's thoracic spine can:
- Significantly shorten the trunk relative to the legs (crankshaft phenomenon)
- Restrict expansion of the rib cage, limiting lung development
- Require revision surgery as unfused segments continue growing around fixed hardware
For this reason, the international standard of care for EOS is growth-friendly surgery. At Central Ortho & Spine, we offer Magnetically Controlled Growing Rods (MCGR), lengthened non-invasively every 3–6 months using an external magnet — no repeated open surgeries needed.
What Is the Right Age for Fusion?
There is no single "right age" — it depends on skeletal maturity, not chronological age. We assess this using:
- Risser grading: bone formation visible on the pelvic iliac apophysis on X-ray (scale 0–5)
- Sanders digital skeletal age: hand X-ray assessment for more precise maturity staging
- Triradiate cartilage status: particularly important in younger children
A child at Risser 0–1 with a 50° curve requires a different approach than a Risser 4 teenager with the same measurement. A specialist paediatric spine surgeon — not a general orthopaedic surgeon — must evaluate each case.
Questions to Ask Your Surgeon
- What is my child's current Risser grade?
- How many vertebral levels will be fused?
- Is a growth-friendly technique appropriate given my child's age?
- How much height gain or loss do you expect from surgery?
Our Approach at Central Ortho & Spine
Prof. Dr. Nurullah Ermiş and our spine team evaluate each child's X-rays, maturity markers, and curve characteristics before recommending a surgical approach. International families can send prior imaging for a remote consultation before travelling to Istanbul. Surgery timing should protect both spinal alignment and the child's remaining growth potential.