Spinal Deformity - Approach

Modern Study Review (AI-Generated)

High-Yield Summary

Spinal deformity encompasses a spectrum of abnormal spinal curvatures, including scoliosis, kyphosis, and lordosis, with significant implications for pain, function, and neurological status. Early recognition through detailed history and physical examination is critical to differentiate benign from progressive or neurologically significant deformities. Modern management prioritizes preserving or improving pain control and functional capacity, with treatment tailored based on deformity flexibility, neurological involvement, and patient-specific factors.

Key Diagnostic Findings

Anatomy

The spine’s normal sagittal and coronal alignments are critical for balanced posture and function.
Deformities may involve vertebral rotation, lateral curvature (scoliosis), or abnormal sagittal profiles (kyphosis/lordosis).
Associated soft tissue and neurological structures must be evaluated for secondary involvement.

Clinical Presentation

History:
Onset and progression of deformity.
Family history of spinal deformity or connective tissue disorders.
Presence of pain is a red flag indicating possible instability, neurological compromise, or underlying pathology.
Neurological symptoms: weakness, sensory changes, bowel/bladder dysfunction.
Functional disability assessment (e.g., limitations in activities of daily living).

Physical Examination:
Inspection: shoulder asymmetry, head position relative to plumb line, pelvic obliquity, leg length discrepancy, foot deformities.
Skin: hairy patches, cutaneous lesions, midline sinuses or clefts suggest underlying spinal dysraphism.
Palpation for tenderness or bony prominences.
Flexibility testing: forward bending (Adams test for scoliosis), side bending to assess curve correctability and rigidity, extension.
Neurological exam: gait analysis (toe walking, heel walking, tandem gait), motor and sensory testing (light touch, pinprick, vibration, proprioception), deep tendon reflexes, abdominal reflexes (absence may indicate upper motor neuron lesion), plantar and Hoffman reflexes.

Imaging

Radiographs: Standing full-length AP and lateral spine films with plumb line assessment.
MRI: Indicated if neurological symptoms or cutaneous stigmata suggest spinal cord pathology or dysraphism.
CT: Useful for detailed bony anatomy in complex deformities or preoperative planning.
EOS imaging: Low-dose 3D imaging for precise deformity assessment and surgical planning.

Classification Systems

Classification	Description	Clinical Utility	Modern Updates
Cobb Angle	Measures degree of lateral curvature on AP radiograph	Defines scoliosis severity	Remains gold standard
Lenke Classification	Categorizes adolescent idiopathic scoliosis based on curve type, lumbar modifier, and sagittal thoracic modifier	Guides surgical decision-making	Widely adopted in current practice
King Classification	Older system for thoracic curves, largely replaced by Lenke	Historical relevance	Supplanted by Lenke
SRS-Schwab Classification	For adult spinal deformity, incorporates sagittal modifiers (pelvic tilt, sagittal vertical axis)	Guides adult deformity management	Standard for adult deformity

Current Gold Standard Treatment

Non-operative

Indicated for mild, flexible deformities without neurological compromise or significant pain.
Observation: Serial clinical and radiographic monitoring for progression.
Bracing: Effective in skeletally immature patients with moderate curves (typically 25-45° Cobb) to prevent progression.
Physical therapy: Focus on core strengthening, posture correction, and pain management.
Pain management: NSAIDs, activity modification.

Operative

Indications: progressive deformity despite bracing, severe curves (>45-50° in adolescents, >60° in adults), neurological deficits, intractable pain, or significant functional impairment.
Surgical goals: deformity correction, spinal balance restoration, neural element decompression, and fusion to prevent progression.
Approaches: posterior spinal fusion with instrumentation is most common; anterior or combined approaches may be used based on deformity characteristics.
Use of modern segmental pedicle screw fixation allows three-dimensional correction and improved outcomes.
Neuromonitoring is standard to minimize neurological injury risk.

Modern Complications & Outcomes

Complications

Complication	Description	Prevention/Management
Neurological injury	Risk during deformity correction	Intraoperative neuromonitoring, careful surgical technique
Infection	Postoperative wound infection	Perioperative antibiotics, sterile technique
Pseudarthrosis	Nonunion of fusion	Adequate fixation, bone grafting
Implant failure	Screw loosening or breakage	Proper implant selection and placement
Adjacent segment disease	Degeneration above/below fusion	Long-term monitoring, surgical planning

Outcomes

Successful deformity correction improves pain, function, and quality of life.
Early intervention in progressive curves yields better long-term spinal balance and reduces disability.
Residual deformity or stiffness may persist but is often outweighed by functional gains.
Multidisciplinary care including rehabilitation optimizes recovery.

Classic Clinical Notes