Fig. 1From: Retrograde entry portal for femoral interlocking nailing in femoral nonunion after plate failure: a prospective comparative study with antergrade portal a The introduction of the reamer up the medullary canal. b The reamer guide-rod inserted through the reamer. c Perforation of the piriformis fossa from within the medullary canal. d The reamer is removed and the reamer guide-rod is exiting from the portalBack to article page