6Mont MA, Hungerford DS. Non-tranmatie avascular necrosis of the femoral head. J Bone Joint Surg Am, 1995, 77:459
7Mitchell DG, Rao VM, Dalinka MK,et al. Femoral head avascular necrosis: correlation of MR imaging, radiographic staging, radionuclide imaging, and clinical findings. Radiology, 1987, 162:709
8Froberg PK, Bransient EM, Buckwalter KA. Osteonerosis transient osteporosis and trensient bone marrow edema: current concepts. Radial Clin North Am, 1996, 34:272
9Kramer J, Breitenseher M, Imhof H,et al. Diagnostic imaging in femur head necrosis. Orthopade, 2000, 29:380
10Hungerford DS. Pathogenetic considerations inischemic necrosis of bone. Can J Surg, 1981, 24:583