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Table 3 OA score; semi-quantitative method

From: Jellyfish mucin may have potential disease-modifying effects on osteoarthritis

  Stage % Involvement (surface, area, volume)
Grade (key feature) Stage 1 <10% Stage 2 10-25% Stage 3 25-50% Stage 4 >50%
Grade 1(surface intact) 1 2 3 4
Grade 2 (surface discontinuity) 2 4 6 8
Grade 3 (vertica fissures, clefts) 3 6 9 12
Grade 4 (erosion) 4 8 12 16
Grade 5(denudation) 5 10 15 20
Grade 6(deformation) 6 12 18 24
  1. Score = grade × stage.