The aim of this study is to evaluate the clinical and radiological outcome of varus derotation osteotomy in Perthes disease. We studied 45 children with a mean age of 9.2 years, belonging to Herring's lateral pillar group B and C treated with varus derotation osteotomy. Containment was achieved in all patients on postoperative radiographs. At a mean follow-up of 6.4 years, good results were obtained in 23, fair in 20, and poor in 2 patients using Catterall's postoperative classification. Radiological evaluation was done using Mose's index and the epiphyseal quotient. Statistical analysis has concluded that better outcome was achieved in patients younger than 10 years of age as compared to those older than 10 years. Our study suggests that varus derotation osteotomy is an effective and easy surgical containment method for children with severe Perthes disease, especially who are younger than 10 years of age.
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