[Follow-up study of Perthes' disease].
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010007:Osteochondritis / Q000000981:diagnostic imaging / Q000628:therapy*; D011859:Radiography