Bending the guide wire
Slightly bending the guide wire 10-15 mm above its tip is helpful for two reasons:
Passing through the fracture site into the distal fragment is easier, since rotation of the guide wire redirects its tip.
It also facilitates the proper position of the tip in the distal metaphysis.
A guide wire like the one illustrated, with its ball a little proximal to the end, allows the bend to be placed beyond the ball, so that it cannot jam inside a cannulated reamer.