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Table 1 Summary of the Weiner classification system

From: The use of the DTO™ hybrid dynamic device: a clinical outcome- and radiological-based prospective clinical trial

  Degeneration Disc height Spur formation Listhesis
Grade 0 none normal none none
Grade 1 mild < 25% narrowing small none
Grade 2 moderate 25–75% narrowing moderate 3-5 mm
Grade 3 advanced/high >  75% narrowing large > 5 mm