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Table 1 The Song classification of pediatric lateral condylar humerus fractures

From: Treatment of pediatric lateral condylar humerus fractures with closed reduction and percutaneous pinning

Stage Degree of
displacement
Fracture pattern Stability
I ≤2 mm Limited fracture line within the metaphysis Stable
II ≤2 mm Fracture line extends to the epiphyseal articular cartilage with a Lateral gap Indefinable
III ≤2 mm Gap as wide laterally as medially Unstable
IV >2 mm Without rotation of fragment Unstable
V >2 mm With rotation of fragment Unstable
  1. Modified from: Song KS, Kang CH, Min BW, et al. Closed reduction and internal fixation of displaced unstable lateral condylar fractures of the humerus in children. J Bone Joint Surg Am. 2008; 90(12):2673–2681