The Radiological Features of the Metaphysis in Perthes Disease

Abstract

The radiographic appearance of the metaphysis was studied in 125 cases of Perthes disease (134 affected hips). Abnormalities were found in 90% and were classified into those with and those without “cysts.” Using a simple definition of a bad result, all such cases had cysts present in the metaphysis, and 76% had extension of the cystic process to involve the lateral metaphyseal cortex. It is suggested that the presence of cysts within the metaphysis, especially if they involve the lateral metaphyseal cortex, is of prognostic significance.