[Effect of the metaphyseal involvement in Perthes' disease and its importance for the definitive development of the head of the femur].

The article describes the effect of the metaphysical involvement in Perthes' disease on the definitive development of the head of the femur. The classification according to Eyring et al. was used as evaluation criterion. Assessment of the results was affected according to the final deformities seen in the head of the femur, as well as according to the epiphyseal quotient and the quotient of the femoral head/neck, and the degree of shortening of the leg. It was found that the severe types of metaphyseal involvement in Perthes' disease have an extremely unfavourable prognosis.