intramedullary nails system tibial nail: uesd with 4mm locking screws, application: for all fractures extending from 7-8cm distal to the tibial plateau, to within 5.5cm fo the distal articular surface, provided that the epiphyses are chosed. tibial nail instrument set, retrograde femoral nail,4mm/5mm locking screws, retrograde femoral nail instrument set.