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Table 1 Facet degeneration grading

From: Does cervical facet degeneration impact surgical outcomes and sagittal balance in patients with radiculopathy?

Grade1 Normal
Grade2 Degenerative changes, including joint space narrowing, cyst formation, and small osteophytes without joint hypertrophy
Grade3 Joint hypertrophy secondary to large osteophytes without fusion
Grade4 Bony fusion of the joint