3Wang GJ,Dughman ss,Reger SI,et al.The effect of core decompression on femoral head blood flow in steroidinduced avascular necrosis of the femoral head.J Bone Joint Surg[AM],1985,67∶121.
4Meyers MH.Osteonecrosis of the femoral head:Pathogenesis and long-term results of treatment.Clin Orthop.1998,231-51.
5Gillespy T.Genant HK,Helms CA.Magnetic resonance imaging of osteonecrosis,Radiol clin North AM,1986,24∶193.