13.2 Pediatric & Adolescent Spinal Deformities: Idiopathic Scoliosis, Kyphosis & Bracing / Surgery

Pediatric & Adolescent Spinal Deformities: Scoliosis, Kyphosis & Surgical Management

Core Clinical Principle: Spinal deformities in children and adolescents are three-dimensional structural disorders that alter coronal alignment, sagittal contours, and axial vertebral rotation. Accurate measurement of the Cobb angle and skeletal maturity (Risser sign) establishes curve progression risk, guiding the transition from observation and rigid orthotic bracing to multi-level posterior spinal fusion with continuous intraoperative and postoperative spinal cord neuromonitoring.

1. Adolescent Idiopathic Scoliosis (AIS): 3D Pathophysiology

Adolescent Idiopathic Scoliosis (AIS) is defined as a lateral coronal curvature of the spine measuring greater than 10° with associated vertebral rotation and altered sagittal alignment occurring in children aged 10 to 18 years without congenital, neuromuscular, or syndromic etiology. While mild curves occur equally in males and females, progressive curves requiring intervention exhibit a marked female predominance (8:1).

                      THE THREE-DIMENSIONAL DEFORMITY OF AIS
  ┌─────────────────────────────────────────────────────────────────────────────┐
  │ 1. Coronal Plane: Lateral deviation of the vertebral column (> 10°)        │
  │ 2. Axial Plane: Transverse rotation of vertebral bodies toward the curve   │
  │    convexity (rotates posterior elements/ribs dorsally, creating rib hump)  │
  │ 3. Sagittal Plane: Hypokyphosis / lordosis of the thoracic spine            │
  └─────────────────────────────────────────────────────────────────────────────┘

Clinical Examination & Screening Protocols

• Adam Forward Bend Test: The screening gold standard. The patient stands with feet together, knees fully straight, and bends forward 90° at the waist with arms hanging relaxed and palms touching. The examiner inspects tangential to the spine from the front and back.
  • Finding: Highlights rotational asymmetry—a prominent unilateral thoracic rib hump or lumbar flank prominence on the convex side of the curve.
• Scoliometer (Inclinometer) Measurement: Placed across the apex of the deformity during the forward bend test to measure the Angle of Trunk Rotation (ATR).
  • Clinical Threshold: An ATR of 5° to 7° warrants referral for standing 36-inch full-spine radiography (correlates with a Cobb angle of approximately 20°).
• Additional Inspection Hallmarks: Shoulder height asymmetry, asymmetric waist creases / flank folds, prominent unilateral scapula, coronal trunk decompensation (plumb line from C7 or occiput deviating laterally from the gluteal cleft), and pelvic obliquity.

2. Radiographic Quantification & Skeletal Maturity Assessment

Standing 36-inch full-spine Posteroanterior (PA) and lateral radiographs are mandatory for definitive diagnosis and curve measurement.

                  RADIOGRAPHIC EVALUATION PARAMETERS
  ┌──────────────────────────────────────┬──────────────────────────────────────┐
  │ Cobb Angle Measurement               │ Risser Sign (Skeletal Maturity)      │
  ├──────────────────────────────────────┼──────────────────────────────────────┤
  │ 1. Identify Upper End Vertebra       │ Evaluates lateral-to-medial          │
  │    (most tilted superior vertebra)   │ ossification of the iliac apophysis: │
  │ 2. Identify Lower End Vertebra       │ • Stage 0: No ossification (HIGH RISK│
  │    (most tilted inferior vertebra)   │ • Stage 1: Lateral 25% ossified      │
  │ 3. Draw intersecting perpendicular   │ • Stage 2: 25%–50% ossified (PHV)    │
  │    lines from endplates.             │ • Stage 3: 50%–75% ossified          │
  │ • Curvature angle = Cobb Angle       │ • Stage 4: 75%–100% excursion        │
  │                                      │ • Stage 5: Complete bony fusion (MATURE)│
  └──────────────────────────────────────┴──────────────────────────────────────┘

The Risser Sign & Peak Height Velocity

Curve progression is directly driven by remaining spinal growth. The risk of curve progression is greatest during Peak Height Velocity (PHV), which occurs at Risser Stage 0 (and early Risser 1) before menarche in females. Once a patient reaches Risser Stage 4 (cessation of spinal growth) or Risser Stage 5 (complete apophyseal fusion), curve progression slows dramatically, though curves >50° continue to progress into adulthood at 1°–2° per year due to asymmetric biomechanical disc loading.

3. AIS Treatment Stratification & Bracing Guidelines

                      AIS TREATMENT ALGORITHM MATRIX
  ┌─────────────────────┬──────────────────────────┬───────────────────────────┐
  │ Cobb Angle          │ Skeletal Maturity Status │ Recommended Intervention  │
  ├─────────────────────┼──────────────────────────┼───────────────────────────┤
  │ **< 25°**           │ Immature (Risser 0–2) or │ **Observation:** Serial   │
  │                     │ Mature (Risser 3–5)      │ standing X-rays q4–6mo.   │
  ├─────────────────────┼──────────────────────────┼───────────────────────────┤
  │ **25° to 45°**      │ **Skeletally Immature**  │ **Rigid Bracing (TLSO):** │
  │                     │ **(Risser 0–2)**         │ Wear 18 to 23 hours/day.  │
  ├─────────────────────┼──────────────────────────┼───────────────────────────┤
  │ **25° to 45°**      │ Skeletally Mature        │ Observation (no brace).   │
  │                     │ (Risser 4–5)             │                           │
  ├─────────────────────┼──────────────────────────┼───────────────────────────┤
  │ **> 45° to 50°**    │ Immature or Mature       │ **Posterior Spinal Fusion**│
  │                     │                          │ with Instrumentation.     │
  └─────────────────────┴──────────────────────────┴───────────────────────────┘

Rigid Bracing Principles & Nursing Patient Education

• Orthosis Selection: Thoracolumbosacral Orthosis (TLSO / Boston Brace, Wilmington Brace) for apex at or below T7; Cervicothoracolumbosacral Orthosis (CTLSO / Milwaukee Brace) rarely for high thoracic curves; nighttime bending braces (Charleston, Providence) for select single flexible curves.
• Crucial Patient / Family Education:
  • Purpose of Bracing: Bracing is designed solely to halt curve progression and avoid surgical fusion; it does NOT permanently reduce, straighten, or cure the existing structural curvature.
  • Dose-Response Compliance: The brace must be worn 18 to 23 hours per day until skeletal maturity is achieved (Risser 4 in females, Risser 5 in males). High-quality prospective trials demonstrate that wear time >18 hours/day achieves >90% success in arresting curve progression, whereas wear time <12 hours/day has outcomes identical to no bracing.
  • Skin Integrity Protocol: Wear a clean, snug-fitting, seamless 100% cotton undershirt under the brace without wrinkles. Strictly avoid applying lotions, oils, or powders under pressure pads (which macerates the skin). Inspect skin daily over bony prominences (iliac crests, ribs, spinous processes) for erythema; transient redness lasting <30 minutes after removal is normal, but persistent non-blanching erythema or breakdown requires orthotist pad adjustment.

4. Scheuermann Kyphosis vs. Postural Roundback

Scheuermann kyphosis is a rigid structural deformity of the thoracic or thoracolumbar spine, differing fundamentally from flexible postural kyphosis:

               DIFFERENTIATING SCHEUERMANN KYPHOSIS FROM POSTURAL ROUNDBACK
  ┌─────────────────────┬──────────────────────────┬──────────────────────────┐
  │ Clinical Parameter  │ Scheuermann Kyphosis     │ Postural Roundback       │
  ├─────────────────────┼──────────────────────────┼──────────────────────────┤
  │ **Spine Flexibility**│ **Rigid / Fixed** (does  │ **Flexible** (completely │
  │                     │ not correct on extension)│ corrects on extension)   │
  ├─────────────────────┼──────────────────────────┼──────────────────────────┤
  │ **Sorensen Criteria**│ **Anterior wedging ≥ 5°**│ No vertebral wedging     │
  │ **Radiography**     │ **across ≥ 3 contiguous**│ (normal trapezoidal/     │
  │                     │ **vertebral bodies**     │ rectangular vertebrae)   │
  ├─────────────────────┼──────────────────────────┼──────────────────────────┤
  │ **Associated Signs**│ • **Schmorl Nodes** (disc│ Normal endplates and     │
  │                     │   herniation into bone)  │ disc spaces              │
  │                     │ • Endplate irregularity  │                          │
  │                     │ • Tight hamstrings       │                          │
  ├─────────────────────┼──────────────────────────┼──────────────────────────┤
  │ **Hyperextension**  │ Sharp, angular apex      │ Smooth, gentle thoracic  │
  │ **Bench Test**      │ remains visible          │ contour restores         │
  └─────────────────────┴──────────────────────────┴──────────────────────────┘

Management of Scheuermann Kyphosis

• Thoracic Kyphosis 50°–75° in Growing Patients: Managed with an extension TLSO or modified Milwaukee brace worn 16–23 hours/day.
• Severe Kyphosis (>75°–80°) with Refractory Pain: Managed with posterior spinal fusion and facet osteotomies (Ponte osteotomies) to restore sagittal balance.

5. Postoperative Nursing Care Following Posterior Spinal Fusion (PSF)

Multi-level posterior spinal fusion with pedicle screw and rod instrumentation entails extensive surgical dissection, substantial blood shifts, and potential spinal cord jeopardy, requiring specialized orthopaedic nursing interventions:

                  POSTOPERATIVE SPINAL NURSING PRIORITIES
  ┌─────────────────────────────────────────────────────────────────────────────┐
  │ 1. Serial Neurological Monitoring (Hourly for 24–48 hours)                  │
  │    • Motor: Dorsiflexion/plantarflexion, great toe extension (EHL/L5), quads│
  │    • Sensory: Dermatomal light touch, sharp/dull discrimination (L1–S1)     │
  │    • Reflexes & bowel/bladder sphincter function                            │
  ├─────────────────────────────────────────────────────────────────────────────┤
  │ 2. Strict Log-Rolling Protocol                                              │
  │    • Maintain head, shoulders, and pelvis in rigid anatomical alignment      │
  │    • Use minimum 2–3 nurses with draw sheet; NO spinal twisting or bending  │
  ├─────────────────────────────────────────────────────────────────────────────┤
  │ 3. Multimodal Opioid-Sparing Analgesia                                      │
  │    • Patient-Controlled Analgesia (PCA: hydromorphone/morphine)             │
  │    • Scheduled IV acetaminophen, gabapentinoids, ketorolac (per surgeon),   │
  │      and antispasmodics (diazepam/methocarbamol for paraspinal spasms)      │
  ├─────────────────────────────────────────────────────────────────────────────┤
  │ 4. Blood Conservation & Drain Surveillance                                  │
  │    • Monitor subfascial/deep wound drains; notify surgeon if >100–200 mL/hr │
  │    • Track serial Hemoglobin/Hematocrit; transfuse cell saver / PRBCs       │
  └─────────────────────────────────────────────────────────────────────────────┘

Superior Mesenteric Artery (SMA) Syndrome (Cast Syndrome)

• Pathophysiology: Rapid surgical lengthening and straightening of the hyperextended spine, or application of a tight body cast/brace, narrows the aortomesenteric angle (normally 45°–60° down to <15°–20°). This compresses the third (transverse) portion of the duodenum between the anterior Superior Mesenteric Artery and the posterior abdominal aorta/spine, causing acute mechanical bowel obstruction.
• Clinical Presentation: Typically arises on postoperative days 2 to 7 when oral intake begins. Manifested by persistent nausea, copious bilious (green-yellow) vomiting, severe postprandial epigastric pain, and abdominal distention.
• Nursing Interventions & Management:
  1. Immediately place the patient NPO (nothing by mouth).
  2. Insert a Nasogastric (NG) tube to low intermittent suction to decompress the stomach and prevent gastric perforation or aspiration.
  3. Position the patient in the left lateral decubitus position or prone position (which pulls the mesentery and SMA anteriorly away from the aorta, opening the duodenal lumen).
  4. Initiate IV fluid resuscitation and correct electrolyte derangements.

Pulmonary & Neuromonitoring Vigilance

• Incentive Spirometry & Pulmonary Toilet: Atelectasis is frequent due to extensive thoracotomy/posterior paraspinal exposure and opioid analgesia. Implement hourly incentive spirometry, coughing/deep breathing, and early out-of-bed mobilization (dangling on POD 1, ambulating with physical therapy on POD 1–2).
• Intraoperative Neuromonitoring (IONM): Postoperatively, sudden loss of lower extremity motor or sensory function is a surgical emergency indicating epidural hematoma, hardware malposition, or spinal cord ischemia, mandating immediate surgeon notification and emergence imaging.