8[9]Chan TW, Dalinka MK, Steinberg ME, et al. MRI appearance of femoral head osteonecrosis following core docempression and bone grafting. Skeletal Radiol, 1991,20:103 - 107.
9[10]Mont MA,Hungerford DS. Non - traumatic avascular necrosis of femoral head. J Bone Joint Surg(Am) ,1995,77:459 -474.
10[11]Mont MA,Jones LC,Einhorn TA,Reddi AH and Hungerford DS. Osteonecrosis of the femoral head: potential treatment with growth and differentiation factors. Clin Orthop, 1998,355:314 - 335.