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Neuromuscular scoliosis of cervicothoracic spine — Clinical Guidelines

Overview

Congenital cervicothoracic scoliosis (CTS) involves spinal deformities originating from the transitional zone between the cervical and thoracic spine, typically spanning from C4 to T4. This condition often manifests as a significant spinal curvature that can rapidly progress, leading to noticeable shoulder and neck imbalances, facial asymmetry, and functional impairments. Given the complexity of the cervicothoracic junction and its proximity to vital neurovascular structures, CTS poses substantial risks if left untreated. Early surgical intervention is frequently recommended to prevent further deformity and complications. In day-to-day practice, recognizing and promptly addressing CTS is crucial to mitigate long-term functional deficits and improve quality of life 1.

Pathophysiology

The pathophysiology of congenital cervicothoracic scoliosis involves congenital anomalies in vertebral formation or segmentation, often including hemivertebrae, which disrupt normal spinal alignment and growth patterns. These anomalies create an imbalance in spinal mechanics, leading to progressive curvature and associated deformities. The transitional nature of the cervicothoracic junction, characterized by a blend of relatively rigid thoracic vertebrae and more flexible cervical vertebrae, exacerbates the deformity due to differing growth rates and flexibility. This imbalance can rapidly manifest as a pronounced scoliotic curve, often accompanied by compensatory mechanisms that further complicate the deformity. Additionally, the proximity to critical neurovascular structures such as the carotid arteries, vertebral arteries, and sympathetic nerves introduces significant surgical risks, including the potential for vascular injury and neurological deficits like Horner syndrome 1 3.

Epidemiology

The incidence of congenital cervicothoracic scoliosis is relatively rare, with specific prevalence figures varying across different populations. Typically, CTS affects children and adolescents, with a slight female predominance observed in reported cases. Geographic and ethnic variations in incidence are not extensively documented, but congenital spinal anomalies generally show some regional clustering due to genetic predispositions or environmental factors. Over time, there has been an increasing awareness and diagnostic capability, potentially leading to higher reported incidences as imaging techniques improve. However, precise trends over time are not consistently reported across studies 1.

Clinical Presentation

Clinical presentation of congenital cervicothoracic scoliosis includes prominent shoulder asymmetry, neck tilt, and facial asymmetry due to the location of the deformity. Patients often present with a noticeable spinal curvature visible on physical examination, accompanied by functional limitations such as restricted neck movement and upper limb involvement. Red-flag features include rapid progression of deformity, neurological deficits (e.g., weakness, sensory loss in the upper extremities), and signs of vascular compromise (e.g., unexplained pain, swelling). Early detection is crucial to prevent these complications and to facilitate timely intervention 1 3.

Diagnosis

The diagnostic approach for congenital cervicothoracic scoliosis involves a comprehensive evaluation combining clinical assessment with advanced imaging techniques. Key diagnostic criteria include:

Imaging Studies:

- X-ray: Initial screening to identify spinal curvature and vertebral anomalies. - CT and MRI: Detailed assessment of vertebral morphology, spinal cord alignment, and neurovascular structures. - CT Angiography (CTA): To evaluate the course of major blood vessels and identify any vascular malformations.

Radiographic Parameters:

- Cobb Angle: Measurement of the primary curve, typically >20° indicative of significant deformity. - Risser Sign: Assessing skeletal maturity, with higher signs indicating greater growth potential. - Spinal Flexibility: Evaluated through lateral bending radiographs, with flexibility ratios crucial for surgical planning.

Neurological Assessment:

- Electroneuromyography (ENMG): To rule out pre-existing neurological abnormalities and assess nerve function.

Differential Diagnosis:

- Idiopathic Scoliosis: Typically affects younger patients and lacks congenital vertebral anomalies. - Neuromuscular Scoliosis: Associated with underlying neurological conditions affecting muscle tone and spinal alignment. - Traumatic or Acquired Deformities: History of trauma or other acquired spinal injuries should be ruled out 1 3.

Management

Surgical Intervention

Given the limited efficacy of conservative treatments like plaster fixation or orthotic bracing, surgical correction is often the primary approach for congenital cervicothoracic scoliosis.

Posterior Approach:

- Correction and Fusion: Recommended for patients with good spinal flexibility and less severe deformities. - Hemivertebra Osteotomy: Indicated for rigid deformities, larger Cobb angles, and significant growth potential to achieve better correction.

Surgical Planning:

- Preoperative Imaging: Comprehensive CT, MRI, and CTA to assess spinal anatomy and vascular pathways. - Neurophysiological Monitoring: Intraoperative monitoring to safeguard neural function. - Individualized Plan: Tailored based on flexibility, deformity severity, and patient-specific characteristics 1.

Posterior Correction Techniques

Three-Column Osteotomy: Utilized for severe deformities to achieve substantial correction.

Selective Hemivertebra Resection: Performed in conjunction with posterior fusion for rigid segments 1.

Contraindications

Severe Neurological Deficits: Preoperative significant neurological impairment may contraindicate aggressive surgical correction.

Extensive Vascular Malformations: High risk of intraoperative vascular complications may necessitate alternative approaches 1.

Complications

Neurological Complications: Damage to spinal nerves, leading to upper limb sensorimotor deficits; Horner syndrome due to sympathetic nerve injury.

Vascular Complications: Intraoperative hemorrhage, postoperative hematoma, and vascular injury risks due to proximity to major vessels.

Surgical Complications: Progressive caudal curve (PCC) post-surgery, often associated with residual local curve and UIV tilt 2 3.

Management Triggers

Neurological Deficits: Immediate neurosurgical consultation and imaging to assess extent of injury.

Vascular Issues: Prompt surgical intervention for hemorrhage control and vascular repair.

Progressive Curves: Regular follow-up imaging and potential revision surgery if progressive caudal curves develop 2.

Prognosis & Follow-up

The prognosis for congenital cervicothoracic scoliosis varies based on the severity of deformity and the effectiveness of surgical correction. Key prognostic indicators include the initial Cobb angle, flexibility of the spine, and the presence of neurological deficits preoperatively. Long-term follow-up is essential, typically involving radiographic assessments every 6-12 months initially, then annually, to monitor curve progression and fusion status. Successful outcomes often correlate with early intervention and meticulous surgical planning 1 2.

Special Populations

Pediatric Patients

Growth Considerations: Management must account for continued spinal growth, potentially requiring staged surgeries.

Surgical Risks: Higher vigilance for neurological and vascular complications due to smaller anatomical spaces 1.

Comorbidities

Neurological Disorders: Pre-existing conditions may complicate surgical planning and increase risk profiles.

Cardiovascular Issues: Patients with cardiovascular anomalies require specialized preoperative and intraoperative care to protect vital structures 1.

Key Recommendations

Early Surgical Intervention: Perform surgery early in patients with clearly diagnosed congenital cervicothoracic scoliosis to prevent deformity progression and functional impairment (Evidence: Strong 1).

Comprehensive Preoperative Imaging: Utilize CT, MRI, and CTA to assess spinal anatomy and vascular pathways before surgery (Evidence: Strong 1).

Individualized Surgical Planning: Tailor surgical approaches based on spinal flexibility, deformity severity, and patient-specific characteristics (Evidence: Moderate 1).

Intraoperative Neurophysiological Monitoring: Implement to safeguard neural function during surgery (Evidence: Moderate 1).

Posterior Approach with Hemivertebra Osteotomy When Indicated: Use hemivertebra osteotomy for rigid deformities to achieve better correction (Evidence: Moderate 1).

Regular Postoperative Follow-Up: Schedule frequent radiographic assessments (6-12 months initially, then annually) to monitor curve progression and fusion status (Evidence: Moderate 1 2).

Monitor for Progressive Caudal Curves: Be vigilant for signs of progressive caudal curves post-surgery and plan for potential revision surgeries (Evidence: Moderate 2).

Consider Neurological and Vascular Risks: Prioritize strategies to minimize risks of neurological deficits and vascular complications, especially in complex cases (Evidence: Expert opinion 1).

Account for Growth in Pediatric Patients: Plan staged surgeries if necessary to accommodate continued spinal growth (Evidence: Expert opinion 1).

Evaluate Comorbid Conditions: Tailor surgical and postoperative care plans considering any pre-existing comorbidities (Evidence: Expert opinion 1).

References

1 Zhang HQ, Du YX, Liu JY, Deng A, Wu JH, Wang YX et al.. Strategy and Efficacy of Surgery for Congenital Cervicothoracic Scoliosis with or without Hemivertebra Osteotomy. Orthopaedic surgery 2022. link 2 Liu Z, Jiang B, Jiang Y, Li Y, Dai Y, Li L et al.. Progressive coronal caudal curve after corrective osteotomies for congenital cervicothoracic scoliosis: incidence and predictors. 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 2024. link 3 Zhu Y, Mao S, Ma Y, Zhou J, Li S, Liu Z et al.. How does congenital cervicothoracic scoliosis bring about early trunk tilt and coronal imbalance during curve progression: a radiographic analysis to dissect the mechanism of proximal takeoff phenomenon. 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 4 Isola N, Herlin C, Chaput B, Aillet S, Watier E, Bertheuil N. Upper body lift and breast reshaping with lateral chest wall perforator propeller flap following massive weight loss. Annales de chirurgie plastique et esthetique 2020. link

Neuromuscular scoliosis of cervicothoracic spine