2[2]Muller Ej,Ostermann RAW,Wick,et al.Fixation of distal femoral fractures with a retrograde intramedullary interlocking nail[J].Injury,1999,30:31
3[3]Khan AM,Ryan MG,Meinhard BP,et al.Use of a cutom retro-grade intramedullary rod for the management of distal femoral nonunion:arepory of two cuses[J].Am J Orthop.1999,28:361