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Home›The Treatise›Chapters›Chapter 28
Tratado de Cirurgia da Coluna Vertebral
SECTION 4 • Spinal Deformities
Chapter28

Early-Onset Scoliosis

Authors:Alexandre Fogaça Cristante•Caio César Nogueira de Figueiredo•Santiago Alexis Naranjo Tipan
Vancouver: Cristante AF, Tipan SAN, Figueiredo CCN📖 Pages: 399-404
Full reading of this chapter is available exclusively in the printed edition of the Treatise.
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Sec. 4Spinal Deformities
Cap. 28Clinical Chapter
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Chapter Summary

• Context: Early-Onset Scoliosis (EOS) encompasses any spinal deformity diagnosed before 10 years of age, regardless of underlying etiology. Its clinical management represents a unique biological challenge because spinal column growth, thoracic cage expansion, and alveolar pulmonary development occur simultaneously during early childhood. The first decade of life represents the critical period of rapid thoracic and alveolar multiplication (alveolar numbers increase from 20 million at birth to 300 million by age 8); severe progressive spinal deformities compromise chest wall development, restrict lung parenchymal growth, and lead to Thoracic Insufficiency Syndrome (TIS), severe restrictive lung disease, and premature cardiopulmonary failure. Conversely, performing extensive definitive spinal fusion at an early age halts axial spinal growth, shortens thoracic spine height (normal T1–S1 length grows from ~20 cm at birth to ~45 cm at maturity), creates a disproportionately small chest cage, and paradoxically induces severe pulmonary insufficiency. EOS constitutes a heterogeneous spectrum spanning idiopathic (infantile and juvenile), congenital (segmentation/formation failures), neuromuscular (spinal muscular atrophy, cerebral palsy), and syndromic/mesenchymal etiologies. Classification and management are standardized by the Classification for Early-Onset Scoliosis (C-EOS), which integrates patient age, etiology, coronal curve magnitude, kyphosis severity, and annual progression velocity. The fundamental therapeutic goal is to control spinal deformity while maximizing longitudinal spinal and thoracic growth using non-operative casting/bracing or growth-friendly surgical techniques (distraction-based traditional or magnetically controlled growing rods [MCGR], compression-based anterior vertebral body tethering [VBT], or guided-growth Shilla/Luque-trolley systems), reserving definitive spinal fusion until skeletal maturity.
• Chapter Objective: To present the physiological, diagnostic, classification, and growth-sparing therapeutic principles of early-onset scoliosis (EOS). The reader should be able to understand the interconnected development of the immature spine, rib cage, and lungs; apply the C-EOS classification system; evaluate progression risk (Mehta Rib-Vertebra Angle Difference [RVAD], phase overlap, etiology); master conservative serial derotation casting (Mehta EDF casting) and bracing protocols; understand the indications, biomechanics, and complications of growth-friendly surgical techniques (traditional growing rods, MCGR, VEPTR); and recognize the long-term biological consequences of premature spinal arthrodesis.
• Spinal Growth, Thoracic Development, and Thoracic Insufficiency SyndromeThe first decade of life features two rapid spinal growth spurts (birth to age 5 and pubertal growth). T1–S1 spine length grows ~10 cm in the first 5 years and ~5 cm between ages 5 and 10. Alveolar development peaks before age 8: severe early deformity restricts thoracic volume, reduces thoracic compliance, and precipitates Thoracic Insufficiency Syndrome (TIS—the inability of the thorax to support normal respiration or lung growth). Campbell demonstrated that achieving a minimal thoracic spine height (T1–T12 >= 18–22 cm at skeletal maturity) is vital for adequate pulmonary vital capacity.
• Etiological Classification and the C-EOS SystemEOS encompasses four distinct etiological groups: 1) Idiopathic: infantile (<3 years) and juvenile (3–9 years); 2) Congenital: vertebral formation or segmentation failures, often associated with VACTERL or intraspinal anomalies; 3) Neuromuscular: hypotonic collapsing curves (SMA, CP) with progressive pelvic obliquity; 4) Syndromic: Marfan, neurofibromatosis, skeletal dysplasias. The Classification for Early-Onset Scoliosis (C-EOS) standardizes categorization by: Etiology (I, C, N, S), Major Curve Cobb Angle (1: <20°, 2: 20°–50°, 3: 50°–90°, 4: >90°), Maximum Kyphosis (-: <20°, N: 20°–50°, +: >50°), and Annual Progression modifier (P0, P1, P2).
• Clinical Evaluation, Mehta RVAD, and Progression RiskEvaluation includes global trunk inspection, chest wall symmetry, skin stigmata, and full neurological assessment. Standing/sitting whole-spine radiographs and traction/suspension films evaluate curve flexibility. In infantile idiopathic scoliosis, Mehta's Rib-Vertebra Angle Difference (RVAD) determines resolution vs. progression: RVAD <20° and Phase 1 rib-head relation indicates resolving scoliosis (80% resolve spontaneously); RVAD >=20° or Phase 2 rib-head overlap onto the apical vertebral body indicates progressive scoliosis requiring early intervention. Whole-spine MRI is mandatory in all EOS patients to detect intraspinal anomalies (Chiari malformation, syringomyelia, tethered cord, present in up to 30% of congenital and juvenile curves).
• Growth-Friendly Management: Conservative and Surgical StrategiesManagement is tiered by age, curve magnitude, and flexibility: 1) Conservative Casting and Bracing: Serial derotation Mehta EDF (Elongation-Derotation-Flexion) casting under general anesthesia on a specialized Risser frame is the first-line treatment for progressive infantile/early juvenile curves, capable of curing idiopathic curves if initiated before age 2; 2) Growth-Friendly Surgical Distraction Techniques: Traditional Growing Rods (TGR, requiring open surgical lengthening every 6 months) or Magnetically Controlled Growing Rods (MCGR, utilizing non-invasive outpatient magnetic lengthening every 6–8 weeks) anchor proximally to upper ribs/vertebrae and distally to lumbar/pelvis; 3) Vertical Expandable Prosthetic Titanium Rib (VEPTR): indicated for fused ribs, congenital thoracic deformities, and TIS; 4) Growth-guided systems (Shilla technique); 5) Definitive fusion: strictly deferred until age >10–12 years whenever possible.
• Clinical Application: In clinical practice, diagnosing scoliosis in a child under 10 years requires an immediate strategy focused on thoracic and pulmonary growth. In an 18-month-old infant with infantile idiopathic scoliosis, calculate Mehta's RVAD: if the curve is 35° with an RVAD of 28° and Phase 2 rib overlap, progressive scoliosis is confirmed; immediately initiate serial Mehta EDF derotational casting under anesthesia every 2–3 months. In progressive cases, serial casting can completely correct the deformity and avoid surgery. In a 6-year-old child with progressive congenital or idiopathic scoliosis exceeding 50° despite bracing, implant dual Magnetically Controlled Growing Rods (MCGR) spanning the thoracic spine to control the curve while performing non-invasive outpatient magnetic lengthenings every 2 months, providing ~1 cm of spinal growth per year without repeated open surgeries. Never perform definitive spinal fusion in children under 8–10 years unless curve progression is life-threatening, as premature fusion causes severe thoracic insufficiency and permanent pulmonary compromise. Obtain whole-spine MRI in every EOS patient to rule out associated syringomyelia, Chiari I, or tethered cord.
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Keywords

Preferred DeCS/MeSH Descriptors:
ScoliosisChild, PreschoolChildThoraxLung Volume MeasurementsSpinal FusionProstheses and ImplantsCasts, Surgical
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Why this chapter matters

Premature spinal fusion in early childhood stops thoracic cage growth, restricts alveolar multiplication, and creates permanent, life-shortening Thoracic Insufficiency Syndrome. Conversely, allowing untreated severe scoliosis to progress rapidly destroys thoracic capacity and leads to cardiopulmonary failure. This chapter provides the evidence-based roadmap to assess growth, calculate progression indices (Mehta RVAD, C-EOS), execute non-operative derotation casting, and deploy modern growth-friendly surgical implants (MCGR) to guide the child safely to skeletal maturity with preserved lung function.

“Early-onset scoliosis is a disorder of the growing spine and developing thorax, not merely a curvature to be straightened. Etiology, progression velocity, curve flexibility, remaining growth potential, and pulmonary developmental windows dictate management. The overarching therapeutic goal is to control deformity while preserving spinal and thoracic growth through serial casting, bracing, or growth-friendly surgical systems (MCGR, growing rods), reserving definitive spinal fusion until skeletal maturity.”
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Chapter Highlights

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Card 1 — Core Concept
Thoracic Growth and Alveolar Development

Pulmonary alveoli multiply from 20 million at birth to 300 million by age 8. Early-onset scoliosis restricts thoracic cage expansion, causing Thoracic Insufficiency Syndrome (TIS). Reconstructive goals must prioritize thoracic volume and lung growth.

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Card 2 — Clinical Decision
Mehta RVAD Distinguishes Resolving from Progressive Curves

In infantile scoliosis, calculate the Rib-Vertebra Angle Difference (RVAD): RVAD <20° and Phase 1 rib relationship indicates resolving curves (80% resolve); RVAD >=20° or Phase 2 rib overlap indicates aggressive progressive scoliosis requiring early Mehta casting.

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Card 3 — Key Pearl / Warning
Avoid Premature Definitive Arthrodesis

Definitive spinal fusion in children <8–10 years arrests thoracic spine growth, causing severe permanent restrictive pulmonary failure. Utilize serial derotation casting or Magnetically Controlled Growing Rods (MCGR) to guide growth until maturity.

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How to Cite this Chapter (Vancouver Format)

Official bibliographic indexing and citation guidelines
📖 Pages: 399-404Vancouver Style
Authors (Vancouver):Cristante AF, Tipan SAN, Figueiredo CCN

Cristante AF, Tipan SAN, Figueiredo CCN. Escoliose de início precoce. In: Pudles E, Defino H, Risso M, editors. Tratado de Cirurgia da Coluna Vertebral (Treatise of Spine Surgery). 1st ed. Rio de Janeiro: Dilivros Editora; 2026. p. 399-404.

ISBN: 978-85-8053-292-0 • 1.ª Edição • Dilivros Editora
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Episode 06 – Early-Onset Scoliosis
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Episode 06 – Early-Onset Scoliosis

Lungs and the Growing Spine: thoracic development, C-EOS classification, and growth-friendly surgical techniques