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Table 2 Yang’s Classification System of Severe Spinal Deformities

From: Risk factors for neurological complications in severe and rigid spinal deformity correction of 177 cases

Classification Neurological Symptoms MRI Findings Evoked Potentials
Type A
Type B -or+ -or+
Type C + -or+ +
  1. MRI magnetic resonance imaging; No, neurological symptoms not present, no spinal cord malformations found on MRI, no positive change in evoked potentials; Yes, neurological symptoms present, spinal cord malformations found on MRI, positive change in evoked potentials