In intwrtochentric fractures treated by DHS the tip apex distance is the most important factor for decreasing get cut out and failure of DHS. Is it applied for PFN .
Tip Apex distance will not be applicable in pfn but central position in lateral view is advocated for good construct. Failure by screw cut trough as in DHS is usually not seen in ideal pfn fixation as screw migrates in horizontal plane leading to various Z or reverse Z pattern.