Courtesy: Prof Nabil Ebraheim, University of Toledo, Ohio, USA

Spine Surgery High-Yield Review: Waddell Signs, Fractures, Adjacent Segment Disease, and Thoracic Discs

Waddell Non-Organic Signs

Waddell signs identify non-organic or behavioral physical responses.
They indicate symptom exaggeration, potential malingering, or secondary psychological gain.
They remain controversial in disability and medicolegal evaluations.
They assess non-anatomical tenderness, axial loading simulation, distraction testing, regional sensory disturbances, and overreaction.

An L4–L5 posterolateral disc herniation compresses the traversing L5 nerve root.
L5 motor innervation supplies the gluteus medius via the superior gluteal nerve.
Denervation leads to hip abductor weakness.
The patient manifests a classic Trendelenburg gait.

Stable burst fractures yield equivalent clinical outcomes with rigid orthosis bracing or surgical stabilization.
Stable patterns allow early ambulation in a molded orthosis.
Absolute Emergency Indication: Progressive neurological deficit in the presence of canal occlusion.
Low lumbar burst fractures associated with laminar fractures risk entrapped nerve roots within the fractured posterior elements.
These injuries carry a high risk of concomitant dural tears.
Surgical management requires wide laminectomy, freeing entrapped neural elements, dural repair, reduction, and instrumented fixation.
Pediatric seatbelt distraction flexion injuries (Chance-type) carry a high incidence of intra-abdominal hollow viscus disruptions, particularly colon perforations.

Primary Driver: Genetics represents the single dominant factor determining intervertebral disc degeneration.
Adjacent Segment Pathology: Adjacent segment disease manifests as adjacent instability, spondylolisthesis, secondary disc herniation, facet arthropathy, or adjacent vertebral fracture.
Performing a laminectomy immediately adjacent to an instrumented fusion segment accelerates adjacent segment breakdown.
Approximately 30% of lumbar fusion patients develop adjacent segment degeneration by 10 years post-surgery.
Lumbar total disc arthroplasty (TDA) aims to preserve motion and lower adjacent level mechanical stress.

Occur predominantly in adult males.
Radicular Symptoms: Dermatomal band-like pain radiating along the ribs toward the anterior chest or abdomen.
Cord Compression Manifestations:
- Gait disturbance and spasticity.
- Completely normal upper extremity neurological examination.
- Bilateral lower extremity upper motor neuron signs (hyperreflexia, sustained clonus, positive Babinski sign).
Imaging: Begin with plain thoracic spine radiographs, followed by a thoracic MRI.
False-Positive MRI Rate: High rate of asymptomatic thoracic disc protrusions on cross-sectional MRI.
Surgical Threshold: Reserved for progressive thoracic myelopathy or refractory radicular pain.
Operative Warning: Isolated posterior laminectomy is strictly contraindicated for central thoracic disc herniations due to a high risk of iatrogenic paraplegia from cord retraction. Safe decompression requires anterior or posterolateral approaches (transthoracic, costotransversectomy, or lateral extracavitary).

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