A method for computer assisted localization of the distal locking holes (11 14) of an implanted intramedullary nail (2) having a nail axis (19) and a first and second distal locking hole (11 14) by A) acquiring one single image IM of the distal end section (25) of said intramedullary nail by means of an X-ray device (9) whose optical axis (30) is oriented essentially perpendicular to the nail axis (19) but irrespective to the orientation of the distal locking holes (11 14) and B) calculating the position of the first and second hole axis (23 20) of the first and second distal locking hole (11 14) with respect to a three-dimensional coordinate system A-COS (7) of the implanted intramedullary nail (2).
