title: Idiopathic osteonecrosis of the patella: an unusual cause of pain in the knee. A case report.
mesh_terms: D000293:Adolescent; D003937:Diagnosis, Differential; D006801:Humans; D010008:Osteochondritis Dissecans / Q000000981:diagnostic imaging*; D010020:Osteonecrosis / Q000000981:diagnostic imaging*; D010329:Patella / Q000000981:diagnostic imaging / Q000473:pathology*; D011859:Radiography