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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