Radiographic results of proximal femoral varus osteotomy in Legg-Calvé-Perthes disease.

A retrospective review of 116 Legg-Calvé-Perthes patients with varus osteotomy for Herring group B and C disease involvement was conducted. Preoperative assessment consisting of anteroposterior pelvis and frog leg lateral radiographs and an arthrogram was performed on all patients. Radiographic extent of disease was classified using Herring's lateral pillar classification system. Radiographic outcome was assessed utilizing Stulberg's classification to grade residual deformity. Follow-up averaged 6 years 9 months (range, 3 years to 15 years 3 months). Stulberg class I and II (spherically congruent) results were obtained in 86% of patients younger than 9 years old with Herring class B disease. Patients 9 years and older with Herring class B disease had spherically congruent results in 67% of cases. Patients with Herring class C disease 9 years and older had spherically congruent results in 30% of cases and 43% spherically congruent results in those younger than 9 years.