title: Perthes' disease--a long term follow-up.
mesh_terms: D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005271:Femur Head Necrosis / Q000000981:diagnostic imaging*; D005500:Follow-Up Studies; D006801:Humans; D007873:Legg-Calve-Perthes Disease / Q000145:classification / Q000000981:diagnostic imaging*; D011379:Prognosis; D011859:Radiography