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Table 1 A CT scoring system of the interbody fusion proposed by Goldschlager et al.

From: Preliminary results in anterior cervical discectomy and fusion with the uncovertebral joint fusion cage in a goat model

Fusion grade Description
Grade 0 No new bone formation
Grade 1 New bone formation but not continuous between C3 and C4 (cleft of discontinuity)
Grade 2 Continuous bridging new bone but comprises < 30% of fusion area
Grade 3 Continuous bridging new bone formation of > 30% of fusion area