Legg-Calve-Perthes disease: Salter-Thompson classification
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Based on the importance of radiographic cresent sign, 2 groups.
- Group A: crescent sign involves < 1/2 of femoral head.
- Group B: crescent sign involves > 1/2 of femoral head.
- Salter RB, Thompson G. Legg-Calvé-Perthes disease. The pronostic significance of the subchondral fracture and a two-group classification of the femoral head involvment. J Bone Joint SurgAm1984;66:479-89