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Table 4 Capanna criteria

From: Treatment of simple bone cysts of the humerus by intramedullary nailing and steroid injection

Classification Clinical manifestation
Grade 1 Completely healing, fully filled with bone
Grade 2 Partially healing, with a small residual cystic area remains
Grade 3 Partially healing, with a large residual cystic area remains
Grade4 Partially healing, with response