1Weinstein JN,Spratt KF,Spengler D,et al.Spinal pedicle fixation:realiability and validity of roentgenogram based as-sessment and surgical factors on successful screw placemen[].SPINE.1988
2Denis F.Spinal instability as defined by the three column spine Concept in acute spinal trauma[].Clinical Orthopaedics and Related Research.1984
3Knut Strø,msø,e.Fracture fixation problems in osteoporosis[].Injury.2004