Radiological Follow-up and Prognosis of Legg-Calve-Perthes Diseases

In 1992 J. A. Herring et al. reported that lateral pillar classification based on radiographic data could predict the outcome of Legg-Calve-Perthes disease. Lateral pillar was defined as the lateral remainder of the epiphysis in its fragmentation stage. The lateral pillars were compared to their contralateral femoral heads and then classified into three groups. Group A: non-involvement of the lateral pillar, Group B: >50% of lateral pillar height maintained and Group C