2Nikolopoulos K, Papadakis S, Katerops K,et al.Functional outcome in patients with avasular necrosis after internal fixation of femoral neck fracture[J]. J Bone Joint Surg(Br),2001,63-B(Suppl Ⅱ ):223.
3Rohrbacher A, Stoik W, Marlovits S,et al.Avasular necrosis of the femoral head caused by femoral neck fracturedoes surgical procedure solve the problem[J].J Bone Joint Surg (Br),83-B(Suppl Ⅱ ):250-251.
4Herngren B.Uppsala screws or Hansson Pins for internal fixation of femoral neck fractures? Aprospcctive study of 180 cases[J].Actu Orthop Scand, 1992,63(1):4.