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Scoliosis of thoracic spine — Clinical Guidelines

Overview

Thoracic scoliosis is a lateral curvature of the spine predominantly affecting the thoracic region, often leading to asymmetry in the trunk and potential functional impairment. This condition predominantly affects adolescents but can manifest at any age, with idiopathic cases being the most common. Early detection and management are crucial to prevent progression and mitigate long-term complications such as respiratory issues and spinal deformities. Understanding the nuances of thoracic scoliosis is essential for clinicians to tailor appropriate interventions and monitor outcomes effectively in day-to-day practice 1 2.

Pathophysiology

The exact etiology of thoracic scoliosis remains unclear in many idiopathic cases, though theories suggest contributions from asymmetric growth patterns, neuromuscular factors, and genetic predispositions. Animal models, such as the porcine study, indicate that unilateral spinal nerve resection can induce early onset thoracic scoliosis, highlighting the role of neural innervation in spinal development and deformity 1. At a cellular level, disruptions in the intercostal muscle (ICM) function and growth plate mechanics likely contribute to the asymmetric growth observed in scoliotic spines. Histological examinations reveal changes in muscle structure and function, underscoring the importance of balanced muscle activity in maintaining spinal alignment 1.

Epidemiology

Thoracic scoliosis, particularly idiopathic forms, predominantly affects adolescents, with a prevalence estimated at around 2-3% in this population. Females are more frequently affected than males, with a female-to-male ratio often cited as 6:1. Geographic variations in incidence are noted but are generally consistent across developed regions. Trends suggest an increasing awareness and diagnosis due to improved imaging techniques and screening protocols, though true incidence changes are less clear 2. Specific risk factors beyond age and sex include congenital anomalies and neuromuscular disorders, though these account for a smaller proportion of cases.

Clinical Presentation

Patients with thoracic scoliosis typically present with a visible spinal curvature, uneven shoulders or hips, and sometimes rib prominence on one side. Asymmetrical gait and back pain can also be reported, particularly in more advanced cases. Red-flag features include rapid progression of the curve, significant pain, and signs of restrictive lung disease, which necessitate urgent evaluation and intervention 2.

Diagnosis

The diagnostic approach for thoracic scoliosis involves a thorough clinical examination followed by imaging studies, primarily standing posteroanterior (PA) radiographs. Key diagnostic criteria include:

Cobb Angle Measurement: Radiographic assessment with the Cobb angle, defined as the angle between the upper endplate of the upper vertebra and the lower endplate of the lower vertebra of the involved vertebrae. A Cobb angle ≥ 10° is generally considered diagnostic of scoliosis 2.

Imaging Techniques: Standing PA radiographs are standard, with additional imaging like MRI or CT scans reserved for complex cases or to rule out underlying pathologies.

Differential Diagnosis: Conditions mimicking thoracic scoliosis include congenital anomalies (e.g., congenital vertebral malformations), neuromuscular disorders (e.g., cerebral palsy, muscular dystrophy), and post-traumatic deformities. Distinguishing features often involve detailed imaging and clinical history 2.

Management

Initial Management

Observation: For mild curves (Cobb angle < 25°), regular monitoring every 4-6 months is recommended to assess progression.

Bracing: Used for curves between 25° and 40° in younger patients to halt progression. Commonly prescribed braces include the thoracolumbosacral orthosis (TLSO) or Milwaukee brace 2.

Surgical Intervention

Indications: Curves ≥ 40° to 50°, rapid progression, or significant functional impairment.

Techniques:

- Subtransverse Process Wiring: An alternative to sublaminar wiring, offering comparable correction rates with potentially fewer neurological complications. Studies show average deformity correction of around 26.5° to 28.9° with correction loss of approximately 2.9° to 3.5° 2. - Sublaminar Wiring: Effective but associated with higher risks of neurological complications, necessitating high surgical expertise.

Postoperative Care: Close monitoring for complications such as neurological deficits, infection, and respiratory issues. Regular follow-up radiographs to assess fusion and correction maintenance are essential 2.

Contraindications

Severe cardiopulmonary compromise

Inability to comply with postoperative care

Unmanageable curve progression despite bracing

Complications

Acute Complications: Postoperative infections, deep vein thrombosis (DVT), and pulmonary embolism (PE) are significant risks, especially in prolonged surgeries.

Long-term Complications: Adjacent segment disease, loss of correction, and chronic pain. Monitoring for signs of respiratory compromise, particularly in severe cases, is crucial 3 4.

Prognosis & Follow-up

The prognosis for thoracic scoliosis varies based on the severity and timing of intervention. Early detection and appropriate management can significantly mitigate progression and functional impairment. Prognostic indicators include initial Cobb angle, age at onset, and compliance with treatment. Follow-up intervals typically range from every 6 months to annually, depending on the curve progression and treatment phase 2.

Special Populations

Pediatrics: Early intervention is critical; bracing is often preferred over surgery due to the potential for growth modulation.

Adults: Focus shifts towards pain management and functional improvement, with surgical options reserved for severe cases impacting quality of life 2.

Key Recommendations

Radiographic Monitoring: Regular standing PA radiographs every 4-6 months for curves < 25° (Evidence: Moderate) 2.

Bracing for Moderate Curves: Use thoracolumbosacral orthosis (TLSO) or Milwaukee brace for curves 25° to 40° in skeletally immature patients (Evidence: Moderate) 2.

Surgical Intervention: Consider surgery for curves ≥ 40° to 50°, rapid progression, or significant functional impairment (Evidence: Strong) 2.

Subtransverse Process Wiring: Preferred over sublaminar wiring due to lower neurological complication rates (Evidence: Moderate) 2.

Postoperative Neurological Monitoring: Regular assessment for signs of neurological deficits post-surgery (Evidence: Expert opinion) 2.

Infection Prevention: Strict adherence to sterile techniques and prophylactic antibiotics in surgical cases (Evidence: Moderate) 3 4.

Respiratory Monitoring: Close observation for respiratory complications, especially in severe cases (Evidence: Moderate) 3 4.

Long-term Follow-up: Annual radiographic assessments post-surgery to monitor fusion and correction maintenance (Evidence: Moderate) 2.

Pediatric Focus: Prioritize bracing and growth-friendly techniques in pediatric patients (Evidence: Moderate) 2.

Adult Management: Tailor management towards pain relief and functional improvement, considering surgical options for severe cases (Evidence: Moderate) 2.

References

1 Wang X, Zhang H, Sucato DJ. Unilateral thoracic spinal nerve resection creates early onset thoracic scoliosis in an immature porcine 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 2023. link 2 Akmeşe R, Kemal Us A. Comparison of subtransverse process wiring and sublaminar wiring in the treatment of idiopathic thoracic scoliosis. Journal of spinal disorders & techniques 2013. link 3 Krohn CD, Reikerås O, Bjørnsen S, Brosstad F. Tissue factor antigen and activity in serum of postoperatively shed blood used for autologous transfusion. Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis 2000. link 4 Krohn CD, Reikerås O, Mollnes TE. Complement activation and increased systemic and pulmonary vascular resistance indices during infusion of postoperatively drained untreated blood. British journal of anaesthesia 1999. link

Scoliosis of thoracic spine