Chapter Clinical Summary
Academic synthesis, diagnostic methodology, and surgical recommendationsNeuromuscular scoliosis is a spinal deformity resulting from underlying neurological or muscular disorders that disrupt postural control and the trunk balance of forces. Unlike idiopathic scoliosis, it typically manifests earlier, progresses more rapidly, and continues to deteriorate even after skeletal maturity. The curves frequently involve extensive thoracolumbar segments and propagate to the sacropelvis, generating severe pelvic obliquity, coronal and sagittal trunk decompensation, and major difficulties with sitting balance, positioning, personal hygiene, and skin integrity. The condition is intimately linked with respiratory, nutritional, and systemic impairment, the magnitude of which varies according to the underlying disorder. Consequently, therapeutic decision-making cannot rely solely on the radiographic Cobb angle. Etiology, gross motor function, ambulatory status, pulmonary reserve, comorbidities, patient quality of life, and caregiver burden must be evaluated in an integrated fashion. The chapter emphasizes a highly individualized, multidisciplinary decision-making model.
To present the core foundations for the clinical assessment, multidisciplinary optimization, and surgical management of neuromuscular scoliosis. The reader will learn to distinguish neuropathic from myopathic etiologies, apply structural and functional classification systems (such as GMFCS and FMS), recognize the biomechanical and functional impact of pelvic obliquity, conduct comprehensive preoperative risk assessments, understand the indications for growth-friendly versus definitive posterior fusion techniques, and anticipate major perioperative complications and realistic functional expectations.
The chapter divides neuromuscular scoliosis into neuropathic and myopathic forms. Neuropathic etiologies arise from central, spinal, peripheral, or mixed neural compromise, including cerebral palsy, myelomeningocele, and spinal muscular atrophy. Myopathic etiologies stem from primary muscle disorders, notably Duchenne and other muscular dystrophies. This distinction is critical because curve behavior, trunk muscle balance, pulmonary decline, and the degree of functional dependence vary substantially according to the underlying disease.
The Lonstein and Akbarnia classification categorizes curve patterns and trunk balance in patients with cerebral palsy. In parallel, the chapter emphasizes functional scales. The Gross Motor Function Classification System (GMFCS), shown in Figure 2, categorizes gross motor impairment. The Functional Mobility Scale (FMS), presented in Figure 3, provides granular data on assisted mobility across home, school, and community settings. These tools connect radiographic deformity to the patient's real-world functional capacity.
Surgical planning must address the spine and pelvis, but equally prioritize the respiratory system, nutritional status, cardiac function, seizure control, bone mineral density, and caregiver support. Plain radiographs in sitting and supine traction positions evaluate trunk balance and flexibility; CT and MRI are utilized according to etiology and instrumentation requirements. Preoperative pulmonary evaluation is paramount due to the high incidence of postoperative respiratory complications. However, the chapter notes that moderate-to-severe pulmonary restriction is not an absolute contraindication if risks are thoroughly optimized and communicated.
Pelvic obliquity represents one of the most critical elements in surgical planning, particularly in non-ambulatory patients. Its clinical sequelae include unstable sitting balance, iliocostal impingement, ischial pressure sores, and increased caregiver physical strain. The decision to extend instrumentation to the pelvis must weigh functional level, magnitude and rigidity of obliquity, primary diagnosis, and the risk of revision surgery. The chapter discusses ongoing controversies and stresses that pelvic fixation should not be decided by a single radiographic parameter.
In very young children, growth-friendly instrumentation may be considered, although the chapter highlights high complication and reoperation rates, recommending stringent indications. Whenever feasible, definitive fusion near the adolescent growth spurt is preferred to avoid repeated surgical interventions in clinically fragile patients. Rigid posterior segmental pedicle screw fixation forms the foundation of modern deformity correction. Severe, rigid curves may require posterior column osteotomies (PCO), three-column osteotomies (PSO/VCR), preoperative halo-gravity traction, or combined approaches. The primary surgical objective is not a 'normal' radiograph, but establishing a balanced, stable trunk over a level pelvis to enhance sitting comfort, respiratory mechanics, skin care, and overall quality of life.
In clinical practice, the evaluation of a patient with neuromuscular scoliosis must start with what the patient can actually do, rather than the Cobb angle alone. Sitting tolerance, transfer ability, self-feeding, hygiene, upper extremity functional use, and wheelchair positioning must be systematically documented alongside GMFCS and FMS scores. Pelvic obliquity should be examined directly in the patient's customized wheelchair and functional posture. Before indicating surgery, the multidisciplinary team must establish whether progressive deformity is actively compromising pulmonary function, sitting stability, skin integrity, comfort, or daily caregiving. The operative risk must be weighed against the natural history of unchecked deformity progression. Preoperative workup mandates nutritional optimization (often via gastrostomy), pulmonary conditioning, and cardiac evaluation (particularly in muscular dystrophies and syndromic conditions). In severe, neglected curves, preoperative halo-gravity traction can safely loosen the deformity, improve nutritional and pulmonary status, and reduce intraoperative neurological risk. In non-ambulatory patients, sacropelvic fixation (such as S2AI screws) is frequently required, whereas in ambulatory patients, preserving lumbar mobility and avoiding fusion to the pelvis protects gait mechanics. Family and caregivers must be aligned from the outset with realistic goals: surgery aims to restore sitting balance, improve head and trunk control, alleviate pain, and simplify caregiving, but cannot restore motor function lost to the underlying neuromuscular disease.