A 69-year-old woman with the sudden onset of severe pain in the right knee.
D000368:Aged; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging*; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging*; D010020:Osteonecrosis / Q000000981:diagnostic imaging*; D010146:Pain / Q000175:diagnosis; D011859:Radiography