title: Spontaneous osteonecrosis of the knee.
mesh_terms: D000368:Aged; D001847:Bone Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging*; D007719:Knee Joint; D008297:Male; D008875:Middle Aged; D010007:Osteochondritis / Q000175:diagnosis / Q000000981:diagnostic imaging*; D011859:Radiography; D011877:Radionuclide Imaging; D013325:Strontium Isotopes
chemical_list: D013325:Strontium Isotopes