[Bone disease with pain. Legg-Calvé-Perthes' disease (LCPD)].

Legg-Calvé-Perthes disease (LCPD) is a relatively common disease in pediatric hip disorder. Now the disease is categorized into osteochondrosis. This disease was firstly reported by Legg A.T. (USA) , Calvé J. (France) , and Perthes G.C. (Germany) in 1910. Since then its pathophysiology, clinical and imaging findings, and natural history have been researched, but the true etiology remains unknown, and effective treatment methods for some types of this disease are not constituted. In this issue, its pathophysiology, clinical symptoms, peculiar features of the imaging modalities, and currently acceptable treatments were addressed.