7Mont MA, Hungerford DS. Non-traumatic avascular necrosis of the femoral head. J Bone Joint Surg (Am), 1995, 77(3): 459-474.
8Ono K, Sugioka Y. Epidemiology and risk factors in avascular necrosis of the femoral head//Schoutens A, Arlet J, Gardeniers JWM, et al. Bone Circulation and Vascularization in Normal and Pathological Condition. New York: Plenum Press, 1993: 241-248.
9Koo KH, Ahn IO, Kim R, et al. Bone marrow edema and associated pain in early stage osteonecrosis of the femoral head: prospective study with serial MR images. Radiology, 1999, 213 (3): 715-722.
10Zizic TM, Hungerford DS, Stevens MB. Ischemic bone necrosis in systemic lupus erythematosus. Ⅱ. The early diagnosis of ischemic necrosis of bone. Medicine, 1980, 59(2): 134-142.