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Infantile idiopathic scoliosis of lumbar spine — Clinical Guidelines

Overview

Infantile idiopathic scoliosis (IIS) is a lateral curvature of the spine occurring in children under three years of age, primarily affecting the lumbar spine. This condition is characterized by its idiopathic nature, meaning no underlying cause is identified, and it poses significant clinical challenges due to the potential for rapid progression and associated pulmonary complications. Early intervention is crucial to prevent deformity progression and maintain thoracic mobility, which is vital for respiratory function. Recognizing and managing IIS effectively in day-to-day practice is essential to mitigate long-term morbidity and improve quality of life 1 5.

Pathophysiology

The exact pathophysiology of infantile idiopathic scoliosis remains unclear, but several theories exist. One prominent hypothesis suggests that asymmetric growth disturbances in the vertebral bodies and intervertebral discs contribute to spinal curvature 6. These disturbances may arise from genetic predispositions, asymmetric muscle tone, or subtle neuromuscular imbalances that affect spinal development from an early age. Additionally, biomechanical factors such as asymmetrical loading forces during growth could exacerbate these asymmetries, leading to progressive deformity 6. Despite these theories, the precise molecular and cellular mechanisms underlying the initiation and progression of IIS are not fully elucidated, necessitating further research to understand the underlying processes better 6.

Epidemiology

Infantile idiopathic scoliosis has an estimated incidence ranging from 0.5% to 1.5% in infants and toddlers 5. It predominantly affects females, with a female-to-male ratio often reported between 3:1 and 6:1, although this ratio can vary 5. Geographically, incidence rates appear consistent across different regions, suggesting a universal pattern rather than specific environmental influences. Over time, there has been a trend towards earlier diagnosis due to increased awareness and improved imaging techniques, which may contribute to perceived increases in reported cases 5. However, the true prevalence remains relatively stable, highlighting the importance of early detection and intervention 5.

Clinical Presentation

Infantile idiopathic scoliosis often presents subtly, with parents noticing asymmetry in the child’s posture or trunk. Typical signs include a visible spinal curve, rib hump on one side, and uneven shoulder or hip heights. Atypical presentations might involve respiratory symptoms if the curvature significantly impacts thoracic mobility, such as recurrent respiratory infections or signs of restrictive lung disease. Red-flag features include rapid progression of the curve, severe deformity, or associated neurological deficits, which necessitate urgent evaluation and intervention 1 5.

Diagnosis

The diagnostic approach for infantile idiopathic scoliosis involves a combination of clinical assessment and imaging studies. Key steps include:

Clinical Examination: Observing posture, spinal curvature, and assessing for asymmetry in the trunk and limbs.

Radiographic Imaging: X-rays are essential for quantifying the Cobb angle, assessing vertebral alignment, and monitoring progression.

- Cobb Angle: Typically, a Cobb angle ≥ 10 degrees is considered significant for intervention 5 9. - Rib-Vertebral Angle (RVA): RVA < 20 degrees often indicates a curve likely to resolve spontaneously, while > 20 degrees suggests a higher risk of progression 7. - Radiographic Parameters: Monitoring changes in vertebral body alignment, rib prominence, and spinal rotation over time 8.

Differential Diagnosis:

Neuromuscular Scoliosis: Distinguished by associated neurological deficits or muscle weakness 6.

Congenital Scoliosis: Identified by vertebral anomalies evident on imaging 5.

Syndromic Scoliosis: Linked to underlying syndromes with characteristic features 5.

Management

Initial Management

Serial Casting (Mehta Casting)

Objective: To correct and stabilize the spinal curvature non-operatively.

Procedure: Serial elongation-de-rotation-flexion (EDF) casts applied every 2-3 months under general anesthesia.

Monitoring: Regular radiographic assessments to evaluate Cobb angle changes and compliance with treatment 2 3 4 9.

Complications to Monitor:

Anesthetic Risks: Endotracheal tube obstruction, respiratory complications 2.

Chest Wall Restriction: Potential impact on ventilation, monitored through peak inspiratory pressure (PIP) changes 10.

Second-Line Interventions

Guided Growth Surgery

Indications: Failure of conservative measures, significant curve progression (Cobb angle > 25-30 degrees).

Techniques: Unilateral magnetically controlled growing rods (uMCGR) initially, followed by conversion to guided growth surgery (GGS) if necessary 1.

Post-Operative Care: Regular follow-ups to adjust rod length and monitor curve correction and spinal growth 1.

Refractory Cases

Surgical Correction

Approach: Posterior spinal fusion with instrumentation for severe, progressive curves unresponsive to previous treatments.

Considerations: Multidisciplinary team involvement including orthopedic surgeons, anesthesiologists, and pulmonologists to manage complex cases 1.

Complications

Acute Complications

Anesthetic Complications: Endotracheal tube obstruction, respiratory distress 2.

Chest Wall Restriction: Increased PIP, potential respiratory compromise 10.

Long-Term Complications

Curve Progression: Despite treatment, some patients may experience curve progression requiring further intervention.

Pulmonary Function: Long-term impact on thoracic mobility and respiratory function, necessitating periodic pulmonary function tests 1 10.

Management Triggers:

Rapid Curve Progression: Immediate referral for surgical consultation.

Respiratory Symptoms: Close monitoring and potential intervention to maintain thoracic expansion 1 10.

Prognosis & Follow-up

The prognosis for infantile idiopathic scoliosis varies widely depending on the initial severity and response to treatment. Prognostic indicators include initial Cobb angle, RVA, and compliance with bracing or casting protocols. Patients with smaller initial curves and favorable radiographic parameters tend to have better outcomes. Recommended follow-up intervals typically involve:

Initial Phase: Monthly radiographic assessments during active treatment.

Stabilization Phase: Every 3-6 months post-treatment initiation to monitor curve stability.

Long-Term Follow-Up: Annual evaluations to assess for late progression and pulmonary function 5 9.

Special Populations

Pediatric Considerations

Growth Impact: Serial casting and surgical interventions must balance curve correction with preserving spinal growth potential.

Anesthesia Risks: Younger children require careful anesthetic management to minimize risks associated with repeated procedures 2 10.

Comorbidities

Neurological Conditions: Presence of neuromuscular disorders may influence treatment choices and outcomes, necessitating tailored approaches 6.

Key Recommendations

Early Detection and Monitoring: Regular clinical and radiographic assessments for infants with suspected scoliosis (Evidence: Strong 5).

Serial Casting for Initial Treatment: Use of EDF casting in children with Cobb angles ≥ 10 degrees (Evidence: Moderate 9).

Consider Guided Growth Surgery: For progressive curves (Cobb angle > 25-30 degrees) unresponsive to casting (Evidence: Moderate 1).

Monitor Pulmonary Function: Regular assessments to evaluate thoracic mobility and respiratory health (Evidence: Moderate 10).

Multidisciplinary Approach: Involvement of orthopedic surgeons, anesthesiologists, and pulmonologists in complex cases (Evidence: Expert opinion).

Radiographic Parameters: Utilize RVA and Cobb angle measurements for prognostic assessment and treatment planning (Evidence: Moderate 7 5).

Anesthetic Safety: Implement stringent protocols to minimize risks during serial casting procedures (Evidence: Moderate 2).

Long-Term Follow-Up: Schedule periodic evaluations to monitor curve progression and pulmonary function (Evidence: Moderate 5 9).

Alternative Casting Frames: Consider cost-effective alternatives to specialized casting tables when resources are limited (Evidence: Expert opinion).

Patient Compliance: Emphasize the importance of adherence to treatment protocols for optimal outcomes (Evidence: Expert opinion).

References

1 Luhmann SJ, Baker D. Breaking the "law of diminishing returns" with novel, staged, unilateral magnetically controlled growing rods to guided growth surgery for severe, progressive infantile scoliosis. Spine deformity 2024. link 2 Ekeoduru RA. Anesthetic Complications in Children Undergoing Mehta Spine Casting: A Case Series. A&A practice 2023. link 3 Tassone C, Syed A, Escott B, Liu XC. Development of orthosis following EDF serial casting for infantile scoliosis. Studies in health technology and informatics 2021. link 4 Thometz J, Liu XC. Follow-up of an Elongation Bending Derotation Brace in the treatment of infantile scoliosis. Studies in health technology and informatics 2021. link 5 Lloyd AP, Jones MEB, Gardner A, Newton Ede MP. Index radiographic measurements in the prediction of progression in infantile idiopathic scoliosis: a comparative analysis and description of a novel predictive model. European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society 2021. link 6 Welborn MC, D'Astous J, Bratton S, Heflin J. Infantile Idiopathic Scoliosis: Factors Affecting EDF Casting Success. Spine deformity 2018. link 7 Tysklind RG, Myung K, Gantsoudes G, Kishan S, Turner C, Lee S et al.. Intraobserver and Interobserver Measurement Variability of the Rib-Vertebral Angle Difference. Journal of pediatric orthopedics 2018. link 8 Hassanzadeh H, Nandyala SV, Puvanesarajah V, Manning BT, Jain A, Hammerberg KW. Serial Mehta Cast Utilization in Infantile Idiopathic Scoliosis: Evaluation of Radiographic Predictors. Journal of pediatric orthopedics 2017. link 9 Iorio J, Orlando G, Diefenbach C, Gaughan JP, Samdani AF, Pahys JM et al.. Serial Casting for Infantile Idiopathic Scoliosis: Radiographic Outcomes and Factors Associated With Response to Treatment. Journal of pediatric orthopedics 2017. link 10 Dhawale AA, Shah SA, Reichard S, Holmes L, Brislin R, Rogers K et al.. Casting for infantile scoliosis: the pitfall of increased peak inspiratory pressure. Journal of pediatric orthopedics 2013. link 11 Halanski MA, Harper BL, Cassidy JA, Crawford HA. Three solutions to a single problem: alternative casting frames for treating infantile idiopathic scoliosis. Journal of spinal disorders & techniques 2013. link

Infantile idiopathic scoliosis of lumbar spine