After preliminary introduction regarding the treatment of Perthes' disease, a critica! study of 25 cases diagnosed between 1975 andJ985 was made at the hospitals of N. ª S.ª de La Candelaria and Clínico Universitario of Canarias. The diferent treatments were conservative, Salter's,.. Chiari's and femoral osteotomies. Clinical and radiological evaluation of the results were carried out after intervals of treatment ranging from 6 to 91 months, the average being 26,5 months. The followed Catterall's, Ducken's and Melenaus' criteria for clinical and radiological evaluation. The Cases which did not receive treatment obtained the worst results. In Perthes' type I the treatment of choice is conservative in Perthes' type II and III femoral osteotomy
