Neurosurgery notes/Spine/Deformity/Classification-Spinal deformity/Nanjing classification

Nanjing classification

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Classification-Spinal deformity
CBD, coronal balance distance.
CBD, coronal balance distance.
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  • Type A
    • Alignment has no coronal imbalance (trunk shift <3 cm)
    • Subtype (Liu 2025)
      • Classes:
        • Type Aa: Coronal balance distance ≤ 1 cm
          • Postoperative postoperative coronal imbalance: 9%
        • Type Ab: Coronal balance distance > 1 cm and C7 plumb line (C7PL) shifted to the concave side of the curve;
          • Postoperative postoperative coronal imbalance: 56%
        • Type Ac: Coronal balance distance > 1 cm and C7PL shifted to the convex side
          • Postoperative postoperative coronal imbalance: 11%
  • Type B
    • Coronal imbalance (trunk shift >3 cm) and C7PL shifted to concave
  • Type C
    • Coronal imbalance (trunk shift >3 cm) and C7PL shifted to convex side
    • Bao 2016
      • Poorer back pain and SF36 physical component score.
      • Greater risk of post-operative coronal imbalance following posterior osteotomy.