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Table 1 Bridwell interbody fusion grading system

From: Posterior wedge osteotomy and debridement for Andersson lesion with severe kyphosis in ankylosing spondylitis

Grade Description
 I Fused with remodeling and trabeculae present
 II Graft intact, not fully remodeled and incorporated, but no lucency present
 III Graft intact, potential lucency present at top and bottom of graft
 IV Fusion absent with collapse/resorption of graft